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Automotive-style miniature relay, dust cover is taken off

A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations.

A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "protective relays".

Basic design and operation[link]

Simple electromechanical relay.

Small "cradle" relay often used in electronics. The "cradle" term refers to the shape of the relay's armature.

A simple electromagnetic relay consists of a coil of wire wrapped around a soft iron core, an iron yoke which provides a low reluctance path for magnetic flux, a movable iron armature, and one or more sets of contacts (there are two in the relay pictured). The armature is hinged to the yoke and mechanically linked to one or more sets of moving contacts. It is held in place by a spring so that when the relay is de-energized there is an air gap in the magnetic circuit. In this condition, one of the two sets of contacts in the relay pictured is closed, and the other set is open. Other relays may have more or fewer sets of contacts depending on their function. The relay in the picture also has a wire connecting the armature to the yoke. This ensures continuity of the circuit between the moving contacts on the armature, and the circuit track on the printed circuit board (PCB) via the yoke, which is soldered to the PCB.

When an electric current is passed through the coil it generates a magnetic field that activates the armature, and the consequent movement of the movable contact(s) either makes or breaks (depending upon construction) a connection with a fixed contact. If the set of contacts was closed when the relay was de-energized, then the movement opens the contacts and breaks the connection, and vice versa if the contacts were open. When the current to the coil is switched off, the armature is returned by a force, approximately half as strong as the magnetic force, to its relaxed position. Usually this force is provided by a spring, but gravity is also used commonly in industrial motor starters. Most relays are manufactured to operate quickly. In a low-voltage application this reduces noise; in a high voltage or current application it reduces arcing.

When the coil is energized with direct current, a diode is often placed across the coil to dissipate the energy from the collapsing magnetic field at deactivation, which would otherwise generate a voltage spike dangerous to semiconductor circuit components. Some automotive relays include a diode inside the relay case. Alternatively, a contact protection network consisting of a capacitor and resistor in series (snubber circuit) may absorb the surge. If the coil is designed to be energized with alternating current (AC), a small copper "shading ring" can be crimped to the end of the solenoid, creating a small out-of-phase current which increases the minimum pull on the armature during the AC cycle.^[1]

A solid-state relay uses a thyristor or other solid-state switching device, activated by the control signal, to switch the controlled load, instead of a solenoid. An optocoupler (a light-emitting diode (LED) coupled with a photo transistor) can be used to isolate control and controlled circuits.

Types[link]

Latching relay[link]

Latching relay with permanent magnet

A latching relay has two relaxed states (bistable). These are also called "impulse", "keep", or "stay" relays. When the current is switched off, the relay remains in its last state. This is achieved with a solenoid operating a ratchet and cam mechanism, or by having two opposing coils with an over-center spring or permanent magnet to hold the armature and contacts in position while the coil is relaxed, or with a remanent core. In the ratchet and cam example, the first pulse to the coil turns the relay on and the second pulse turns it off. In the two coil example, a pulse to one coil turns the relay on and a pulse to the opposite coil turns the relay off. This type of relay has the advantage that one coil consumes power only for an instant, while it is being switched, and the relay contacts retain this setting across a power outage. A remanent core latching relay requires a current pulse of opposite polarity to make it change state.

Reed relay[link]

A reed relay is a reed switch enclosed in a solenoid. The switch has a set of contacts inside an evacuated or inert gas-filled glass tube which protects the contacts against atmospheric corrosion; the contacts are made of magnetic material that makes them move under the influence of the field of the enclosing solenoid. Reed relays can switch faster than larger relays, require only little power from the control circuit, but have low switching current and voltage ratings. In addition, the reeds can become magnetized over time, which makes them stick 'on' even when no current is present; changing the orientation of the reeds with respect to the solenoid's magnetic field will fix the problem.

Top, middle: reed switches, bottom: reed relay

Mercury-wetted relay[link]

A mercury-wetted reed relay is a form of reed relay in which the contacts are wetted with mercury. Such relays are used to switch low-voltage signals (one volt or less) where the mercury reduces the contact resistance and associated voltage drop, for low-current signals where surface contamination may make for a poor contact, or for high-speed applications where the mercury eliminates contact bounce. Mercury wetted relays are position-sensitive and must be mounted vertically to work properly. Because of the toxicity and expense of liquid mercury, these relays are now rarely used. See also mercury switch.

Polarized relay[link]

A polarized relay placed the armature between the poles of a permanent magnet to increase sensitivity. Polarized relays were used in middle 20th Century telephone exchanges to detect faint pulses and correct telegraphic distortion. The poles were on screws, so a technician could first adjust them for maximum sensitivity and then apply a bias spring to set the critical current that would operate the relay.

• External links

  • Schematic diagram of a polarized relay used in a teletype machine.

Machine tool relay[link]

A machine tool relay is a type standardized for industrial control of machine tools, transfer machines, and other sequential control. They are characterized by a large number of contacts (sometimes extendable in the field) which are easily converted from normally-open to normally-closed status, easily replaceable coils, and a form factor that allows compactly installing many relays in a control panel. Although such relays once were the backbone of automation in such industries as automobile assembly, the programmable logic controller (PLC) mostly displaced the machine tool relay from sequential control applications.

A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems. A number of relays could be used together to carry out complex functions (relay logic). The principle of relay logic is based on relays which energize and de-energize associated contacts. Relay logic is the predecessor of ladder logic, which is commonly used in Programmable logic controllers.

Ratchet relay[link]

This is again a clapper type relay which does not need continuous current through its coil to retain its operation.

Contactor relay[link]

A contactor is a very heavy-duty relay used for switching electric motors and lighting loads, although contactors are not generally called relays. Continuous current ratings for common contactors range from 10 amps to several hundred amps. High-current contacts are made with alloys containing silver. The unavoidable arcing causes the contacts to oxidize; however, silver oxide is still a good conductor.^[2] Such devices are often used for motor starters. A motor starter is a contactor with overload protection devices attached. The overload sensing devices are a form of heat operated relay where a coil heats a bi-metal strip, or where a solder pot melts, releasing a spring to operate auxiliary contacts. These auxiliary contacts are in series with the coil. If the overload senses excess current in the load, the coil is de-energized. Contactor relays can be extremely loud to operate, making them unfit for use where noise is a chief concern.

Solid-state relay[link]

Solid state relay with no moving parts

A solid state relay (SSR) is a solid state electronic component that provides a similar function to an electromechanical relay but does not have any moving components, increasing long-term reliability. Every solid-state device has a small voltage drop across it. This voltage drop limited the amount of current a given SSR could handle. The minimum voltage drop for such a relay is a function of the material used to make the device. Solid-state relays rated to handle as much as 1,200 Amperes, have become commercially available. Compared to electromagnetic relays, they may be falsely triggered by transients.

Solid state contactor relay[link]

A solid state contactor is a heavy-duty solid state relay, including the necessary heat sink, used for switching electric heaters, small electric motors and lighting loads; where frequent on/off cycles are required. There are no moving parts to wear out and there is no contact bounce due to vibration. They are activated by AC control signals or DC control signals from Programmable logic controller (PLCs), PCs, Transistor-transistor logic (TTL) sources, or other microprocessor and microcontroller controls.

Buchholz relay[link]

A Buchholz relay is a safety device sensing the accumulation of gas in large oil-filled transformers, which will alarm on slow accumulation of gas or shut down the transformer if gas is produced rapidly in the transformer oil.

Forced-guided contacts relay[link]

A forced-guided contacts relay has relay contacts that are mechanically linked together, so that when the relay coil is energized or de-energized, all of the linked contacts move together. If one set of contacts in the relay becomes immobilized, no other contact of the same relay will be able to move. The function of forced-guided contacts is to enable the safety circuit to check the status of the relay. Forced-guided contacts are also known as "positive-guided contacts", "captive contacts", "locked contacts", or "safety relays".

Overload protection relay[link]

Electric motors need overcurrent protection to prevent damage from over-loading the motor, or to protect against short circuits in connecting cables or internal faults in the motor windings.^[3] One type of electric motor overload protection relay is operated by a heating element in series with the electric motor. The heat generated by the motor current heats a bimetallic strip or melts solder, releasing a spring to operate contacts. Where the overload relay is exposed to the same environment as the motor, a useful though crude compensation for motor ambient temperature is provided.

Pole and throw[link]

Circuit symbols of relays. (C denotes the common terminal in SPDT and DPDT types.)

Since relays are switches, the terminology applied to switches is also applied to relays. A relay will switch one or more poles, each of whose contacts can be thrown by energizing the coil in one of three ways:

• Normally-open (NO) contacts connect the circuit when the relay is activated; the circuit is disconnected when the relay is inactive. It is also called a Form A contact or "make" contact. NO contacts can also be distinguished as "early-make" or NOEM, which means that the contacts will close before the button or switch is fully engaged.
• Normally-closed (NC) contacts disconnect the circuit when the relay is activated; the circuit is connected when the relay is inactive. It is also called a Form B contact or "break" contact. NC contacts can also be distinguished as "late-break" or NCLB, which means that the contacts will stay closed until the button or switch is fully disengaged.
• Change-over (CO), or double-throw (DT), contacts control two circuits: one normally-open contact and one normally-closed contact with a common terminal. It is also called a Form C contact or "transfer" contact ("break before make"). If this type of contact utilizes a "make before break" functionality, then it is called a Form D contact.

The following designations are commonly encountered:

• SPST – Single Pole Single Throw. These have two terminals which can be connected or disconnected. Including two for the coil, such a relay has four terminals in total. It is ambiguous whether the pole is normally open or normally closed. The terminology "SPNO" and "SPNC" is sometimes used to resolve the ambiguity.
• SPDT – Single Pole Double Throw. A common terminal connects to either of two others. Including two for the coil, such a relay has five terminals in total.
• DPST – Double Pole Single Throw. These have two pairs of terminals. Equivalent to two SPST switches or relays actuated by a single coil. Including two for the coil, such a relay has six terminals in total. The poles may be Form A or Form B (or one of each).
• DPDT – Double Pole Double Throw. These have two rows of change-over terminals. Equivalent to two SPDT switches or relays actuated by a single coil. Such a relay has eight terminals, including the coil.

The "S" or "D" may be replaced with a number, indicating multiple switches connected to a single actuator. For example 4PDT indicates a four pole double throw relay (with 14 terminals).

EN 50005 are among applicable standards for relay terminal numbering; a typical EN 50005-compliant SPDT relay's terminals would be numbered 11, 12, 14, A1 and A2 for the C, NC, NO, and coil connections, respectively.

Applications[link]

Relays are used to and for:

• Amplify a digital signal, switching a large amount of power with a small operating power. Some special cases are:
  • A telegraph relay, repeating a weak signal received at the end of a long wire
  • Controlling a high-voltage circuit with a low-voltage signal, as in some types of modems or audio amplifiers,
  • Controlling a high-current circuit with a low-current signal, as in the starter solenoid of an automobile,
• Detect and isolate faults on transmission and distribution lines by opening and closing circuit breakers (protection relays),

A DPDT AC coil relay with "ice cube" packaging

• Isolate the controlling circuit from the controlled circuit when the two are at different potentials, for example when controlling a mains-powered device from a low-voltage switch. The latter is often applied to control office lighting as the low voltage wires are easily installed in partitions, which may be often moved as needs change. They may also be controlled by room occupancy detectors to conserve energy,
• Logic functions. For example, the boolean AND function is realised by connecting normally open relay contacts in series, the OR function by connecting normally open contacts in parallel. The change-over or Form C contacts perform the XOR (exclusive or) function. Similar functions for NAND and NOR are accomplished using normally closed contacts. The Ladder programming language is often used for designing relay logic networks.
  • The application of Boolean Algebra to relay circuit design was formalized by Claude Shannon in A Symbolic Analysis of Relay and Switching Circuits
  • Early computing. Before vacuum tubes and transistors, relays were used as logical elements in digital computers. See electro-mechanical computers such as ARRA (computer), Harvard Mark II, Zuse Z2, and Zuse Z3.
  • Safety-critical logic. Because relays are much more resistant than semiconductors to nuclear radiation, they are widely used in safety-critical logic, such as the control panels of radioactive waste-handling machinery.
• Time delay functions. Relays can be modified to delay opening or delay closing a set of contacts. A very short (a fraction of a second) delay would use a copper disk between the armature and moving blade assembly. Current flowing in the disk maintains magnetic field for a short time, lengthening release time. For a slightly longer (up to a minute) delay, a dashpot is used. A dashpot is a piston filled with fluid that is allowed to escape slowly. The time period can be varied by increasing or decreasing the flow rate. For longer time periods, a mechanical clockwork timer is installed.
• Vehicle battery isolation. A 12v relay is often used to isolate any second battery in cars, 4WDs, RVs and boats.
• Switching to a standby power supply.

Relay application considerations[link]

A large relay with two coils and many sets of contacts, used in an old telephone switching system.

Selection of an appropriate relay for a particular application requires evaluation of many different factors:

• Number and type of contacts – normally open, normally closed, (double-throw)
• Contact sequence – "Make before Break" or "Break before Make". For example, the old style telephone exchanges required Make-before-break so that the connection didn't get dropped while dialing the number.
• Rating of contacts – small relays switch a few amperes, large contactors are rated for up to 3000 amperes, alternating or direct current
• Voltage rating of contacts – typical control relays rated 300 VAC or 600 VAC, automotive types to 50 VDC, special high-voltage relays to about 15 000 V
• Operating lifetime, useful life - the number of times the relay can be expected to operate reliably. There is both a mechanical life and a contact life; the contact life is naturally affected by the kind of load being switched.
• Coil voltage – machine-tool relays usually 24 VDC, 120 or 250 VAC, relays for switchgear may have 125 V or 250 VDC coils, "sensitive" relays operate on a few milliamperes
• Coil current - including minimum current required to operate reliably and minimum current to hold. Also effects of power dissipation on coil temperature at various duty cycles.
• Package/enclosure – open, touch-safe, double-voltage for isolation between circuits, explosion proof, outdoor, oil and splash resistant, washable for printed circuit board assembly
• Operating environment - minimum and maximum operating temperatures and other environmental considerations such as effects of humidity and salt
• Assembly – Some relays feature a sticker that keeps the enclosure sealed to allow PCB post soldering cleaning, which is removed once assembly is complete.
• Mounting – sockets, plug board, rail mount, panel mount, through-panel mount, enclosure for mounting on walls or equipment
• Switching time – where high speed is required
• "Dry" contacts – when switching very low level signals, special contact materials may be needed such as gold-plated contacts
• Contact protection – suppress arcing in very inductive circuits
• Coil protection – suppress the surge voltage produced when switching the coil current
• Isolation between coil contacts
• Aerospace or radiation-resistant testing, special quality assurance
• Expected mechanical loads due to acceleration – some relays used in aerospace applications are designed to function in shock loads of 50 g or more
• Accessories such as timers, auxiliary contacts, pilot lamps, test buttons
• Regulatory approvals
• Stray magnetic linkage between coils of adjacent relays on a printed circuit board.

There are many considerations involved in the correct selection of a control relay for a particular application. These considerations include factors such as speed of operation, sensitivity, and hysteresis. Although typical control relays operate in the 5 ms to 20 ms range, relays with switching speeds as fast as 100 us are available. Reed relays which are actuated by low currents and switch fast are suitable for controlling small currents.

As for any switch, the current through the relay contacts (unrelated to the current through the coil) must not exceed a certain value to avoid damage. In the particular case of high-inductance circuits such as motors other issues must be addressed. When a power source is connected to an inductance, an input surge current which may be several times larger than the steady current exists. When the circuit is broken, the current cannot change instantaneously, which creates a potentially damaging spark across the separating contacts.

Consequently for relays which may be used to control inductive loads we must specify the maximum current that may flow through the relay contacts when it actuates, the make rating; the continuous rating; and the break rating. The make rating may be several times larger than the continuous rating, which is itself larger than the break rating.

Derating factors[link]

Control relays should not be operated above rated temperature because of resulting increased degradation and fatigue. Common practice is to derate 20 degrees Celsius from the maximum rated temperature limit. Relays operating at rated load are also affected by their environment. Oil vapors may greatly decrease the contact tip life, and dust or dirt may cause the tips to burn before their normal life expectancy. Control relay life cycle varies from 50,000 to over one million cycles depending on the electrical loads of the contacts, duty cycle, application, and the extent to which the relay is derated. When a control relay is operating at its derated value, it is controlling a lower value of current than its maximum make and break ratings. This is often done to extend the operating life of the control relay. The table lists the relay derating factors for typical industrial control applications.

Undesired arcing[link]

Without adequate contact protection, the occurrence of electric current arcing causes significant degradation of the contacts in relays, which suffer significant and visible damage. Every time a relay transitions either from a closed to an open state (break arc) or from an open to a closed state (make arc & bounce arc), under load, an electrical arc can occur between the two contact points (electrodes) of the relay. The break arc is typically more energetic and thus more destructive.

The heat energy contained in the resulting electrical arc is very high (tens of thousands of degrees Fahrenheit), causing the metal on the contact surfaces to melt, pool and migrate with the current. The extremely high temperature of the arc cracks the surrounding gas molecules creating ozone, carbon monoxide, and other compounds. The arc energy slowly destroys the contact metal, causing some material to escape into the air as fine particulate matter. This very activity causes the material in the contacts to degrade quickly, resulting in device failure. This contact degradation drastically limits the overall life of a relay to a range of about 10,000 to 100,000 operations, a level far below the mechanical life of the same device, which can be in excess of 20 million operations.^[4]

Protective relays[link]

For protection of electrical apparatus and transmission lines, electromechanical relays with accurate operating characteristics were used to detect overload, short-circuits, and other faults. While many such relays remain in use, digital devices now provide equivalent protective functions.

Railway signalling[link]

Part of a relay interlocking using UK Q-style miniature plug-in relays.

UK Q-style signalling relay and base.

Railway signalling relays are very big and cumbersome compared to the mostly small voltages (less than 120 V) and currents (perhaps 100 mA) that they switch. Contacts are widely spaced to prevent dangerous flashovers and short circuits over a lifetime that may exceed fifty years. BR930 series plug-in relays are widely used on railways following British practice. These are 120 mm high, 180 mm deep and 56 mm wide and weigh about 1400 g, and can have up to 16 separate contacts, say 12 make and 4 break contacts.

Since rail signal circuits must be highly reliable, special techniques are used to detect and prevent failures in the relay system. To protect against false feeds, double switching relay contacts are often used on both the positive and negative side of a circuit, so that two false feeds are needed to cause a false signal. Not all relay circuits can be proved so there is reliance on construction features such as carbon to silver contacts to resist lightning induced contact welding and to provide AC immunity.

Opto-isolators are also used in some instances with railway signalling, especially where only a single contact is to be switched.

Signalling relays and their circuits come in a number of schools, including:

• British
• American
• German
• France

American signaling relays are the origin of the 19 inch rack.

History[link]

In 1835, the relay was invented by American scientist Joseph Henry to improve his version of the electrical telegraph, developed in 1831.^[5][6]

A ‘relay’ or ‘repeater’ of Edward Davy of 1837/1838 was used in his electric telegraph.^{[citation needed]}

A simple device, which we now call a relay, was included in the original 1840 telegraph patent^[7] of Samuel Morse. The mechanism described acted as a digital amplifier, repeating the telegraph signal, and thus allowing signals to be propagated as far as desired. This overcame the problem of limited range of earlier telegraphy schemes.^{[citation needed]}

See also[link]

• Contactor
• Digital protective relay
• Dry contact
• Race condition
• Stepping switch - a kind of multi-position relay
• Wire spring relay

References[link]

This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please improve this article by introducing more precise citations. (October 2009)

External links[link]

Wikimedia Commons has media related to: Relay

• Information about relays and the Latching Relay circuit
• "Harry Porter's Relay Computer", a computer made out of relays.
• "Relay Computer Two", by Jon Stanley.
• Interfacing Relay To Microcontroller.
• A Relay General Application Guidelines

Usain Bolt

Bolt at Berlin World Championships 2009
Personal information
Nickname(s)	Lightning Bolt
Nationality	Jamaican
Born	(1986-08-21) 21 August 1986 (age 25)[1] Trelawny, Jamaica[2]
Residence	Kingston, Jamaica
Height	1.95 m (6 ft 5 in)[3]
Weight	92 kg (200 lb)[3]
Sport
Sport	Track and field
Event(s)	Sprints
Club	Racers Track Club
Achievements and titles
Personal best(s)	100 m: 9.58 WR (Berlin 2009)[4] 150 m: 14.35 WB[5] (Manchester 2009)[6] 200 m: 19.19 WR (Berlin 2009)[7] 400 m: 45.28 (Kingston 2007)[1]
Medal record Men's athletics Competitor for  Jamaica Olympic Games Gold 2008 Beijing 100 m Gold 2008 Beijing 200 m Gold 2008 Beijing 4×100 m relay World Championships Gold 2011 Daegu 200 m Gold 2011 Daegu 4×100 m relay Gold 2009 Berlin 100 m Gold 2009 Berlin 200 m Gold 2009 Berlin 4×100 m relay Silver 2007 Osaka 200 m Silver 2007 Osaka 4×100 m relay World Athletics Final Gold 2009 Thessaloniki 200 m CAC Championships Gold 2005 Nassau 200 m World Junior Championships Gold 2002 Kingston Silver 2002 Kingston 4×100 m relay Silver 2002 Kingston 4×400 m relay Pan American Junior Championships Gold 2003 Bridgetown 200 m Silver 2003 Bridgetown 4×100 m relay CARIFTA Games (Junior) Gold 2004 Hamilton 200 m Gold 2004 Hamilton 4×100 m relay Gold 2004 Hamilton 4×400 m relay Gold 2003 Port of Spain 200 m Gold 2003 Port of Spain 400 m Gold 2003 Port of Spain 4×100 m relay Gold 2003 Port of Spain 4×400 m relay World Youth Championships Gold 2003 Sherbrooke 200 m CAC Junior Championships (Youth) Gold 2002 Bridgetown 200 m Gold 2002 Bridgetown 400 m Gold 2002 Bridgetown 4×100 m relay Gold 2002 Bridgetown 4×400 m relay CARIFTA Games (Youth) Gold 2002 Nassau 200 m Gold 2002 Nassau 400 m Gold 2002 Nassau 4×400 m relay Silver 2001 Bridgetown 200m Silver 2001 Bridgetown 400m Competitor for the Americas World Cup Silver 2006 Athens 200 m

The Honourable Usain St. Leo Bolt, OJ, C.D. ( /ˈjuːseɪn/;^[8] born 21 August 1986), is a Jamaican sprinter and a five-time World and three-time Olympic gold medalist. He is the world record and Olympic record holder in the 100 metres, the 200 metres and (along with his teammates) the 4×100 metres relay. He is the reigning Olympic champion in these three events, and is one of only seven athletes (along with Valerie Adams, Veronica Campbell-Brown, Jacques Freitag, Yelena Isinbayeva, Jana Pittman, Dani Samuels) to win world championships at the youth, junior, and senior level of an athletic event.

Bolt won a 200 m gold medal at the 2002 World Junior Championships, making him the competition's youngest-ever gold medalist at the time (since surpassed by Jacko Gill). In 2004, at the CARIFTA Games, he became the first junior sprinter to run the 200 m in less than 20 seconds with a time of 19.93 s,^[9] breaking the previous world junior record held by Roy Martin by two-tenths of a second. He turned professional in 2004, and although he competed at the 2004 Summer Olympics, he missed most of the next two seasons due to injuries. In 2007, he broke Don Quarrie's 200 m Jamaican record with a run of 19.75 s.

His 2008 season began with his first world record performance—a 100 m world record of 9.72 s—and culminated in world and Olympic records in both the 100 m and 200 m events at the 2008 Beijing Summer Olympics. He ran 9.69 s for the 100 m and 19.30 s in the 200 m, and also set a 4×100 m relay record of 37.10 s with the Jamaican team. This made him the first man to win three sprinting events at a single Olympics since Carl Lewis in 1984, and the first man to set world records in all three at a single Olympics. The following year he further lowered his own 100 m and 200 m world records to 9.58 s and 19.19 s respectively at the 2009 World Championships.^[10] This made him the first man to hold both the 100 and 200 m world and Olympic titles at the same time.

His 2009 record breaking margin over 100 m is the highest since the start of digital time measurements.^[11] His achievements in sprinting have earned him the media nickname "Lightning Bolt",^[12] and awards including the IAAF World Athlete of the Year, Track & Field Athlete of the Year, and Laureus Sportsman of the Year.

Early years[link]

Bolt was born on 21 August 1986 in Sherwood Content,^[13] a small town in Trelawny, Jamaica, and grew up with his parents, Wellesley and Jennifer Bolt, his brother Sadeeki,^[14] and his sister Sherine.^[2][15] His parents ran the local grocery store in the rural area, and Bolt spent his time playing cricket and football in the street with his brother,^[16] later saying, "When I was young, I didn’t really think about anything other than sports".^[17]

As a child, he attended Waldensia Primary and All-age School, and it was here that he first began to show his sprinting potential, running in the annual national primary-schools' meeting for his parish.^[12] By the age of twelve, Bolt had become the school's fastest runner over the 100 metres distance.^[18]

Upon his entry to William Knibb Memorial High School, Bolt continued to focus on other sports, but his cricket coach noticed Bolt's speed on the pitch and urged him to try track and field events.^[19] Pablo McNeil, a former Olympic sprint athlete,^[20] and Dwayne Barrett coached Bolt, encouraging him to focus his energy on improving his athletic abilities. The school had a history of success in athletics with past students, including sprinter Michael Green.^[12] Bolt won his first annual high school championships medal in 2001, taking the silver medal in the 200 metres with a time of 22.04 seconds.^[12] McNeil soon became his primary coach, and the two enjoyed a positive partnership, although McNeil was occasionally frustrated by Bolt's lack of dedication to his training and his predisposition to practical jokes.^[20]

Early competitions[link]

Performing for Jamaica in his first Caribbean regional event, Bolt clocked a personal best of 48.28 s in the 400 metres in the 2001 CARIFTA Games, winning a silver medal. The 200 m also yielded a silver as Bolt finished in 21.81 s.^[21]

He made his first appearance on the world stage at the 2001 IAAF World Youth Championships in Debrecen, Hungary. Running in the 200 m event, he failed to qualify for the finals, but he still set a new personal best of 21.73 s.^[22] Bolt still did not take athletics or himself too seriously, however, and he took his mischievousness to new heights by hiding in the back of a van when he was supposed to be preparing for the 200 m finals at the CARIFTA Trials. He was detained by the police for his practical joke, and there was an outcry from the local community, which blamed coach McNeil for the incident.^[20] However, the controversy subsided, and both McNeil and Bolt went to the CARIFTA Games, where Bolt set championship records in the 200 m and 400 m with times of 21.12 s and 47.33 s, respectively.^[21] He continued to set records with 20.61 s and 47.12 s finishes at the Central American and Caribbean Junior Championships.^[23]

Former Prime Minister P. J. Patterson recognised Bolt's talent and arranged for him to move to Kingston, along with Jermaine Gonzales, so he could train with the Jamaica Amateur Athletic Association (JAAA) at the University of Technology, Jamaica.^[20]

Rise to prominence[link]

The 2002 World Junior Championships before a home crowd in Kingston, Jamaica, gave Bolt a chance to prove his credentials on the world stage. By the age of 15, he had grown to 1.96 metres (6 ft 5 in) tall, and he physically stood out amongst his peers.^[12] He won the 200 m, in a time of 20.61 s,^[24] 0.03 seconds slower than his personal best of 20.58 s set in the 1st round.^[25] Bolt's 200 m win made him the youngest world-junior gold medalist ever.^[26] The expectation from the home crowd had made him so nervous that he had put his shoes on the wrong feet. However, it turned out to be a revelatory experience for Bolt as he vowed never again to let himself be affected by pre-race nerves.^[27] As a member of the Jamaican sprint relay team, he also took two silver medals and set national junior records in the 4×100 metres and 4×400 metres relay, running times of 39.15 s and 3:04.06 minutes respectively.^[28][29]

The flow of medals continued as he won four gold medals at the 2003 CARIFTA Games, and was awarded the Austin Sealy Trophy for the most outstanding athlete of the games.^[30][31][32] He won another gold at the 2003 World Youth Championships. He set a new championship record in the 200 m with a time of 20.40 s, despite a 1.1 m/s head wind.^[33] Michael Johnson, the 200 m world-record holder, took note of Bolt's potential but worried that the young sprinter might be over-pressured, stating, "It's all about what he does three, four, five years down the line".^[34] Bolt had also impressed the athletics hierarchy, and he received the IAAF Rising Star Award for 2002.^[35]

Bolt turned his main focus to the 200 m and equalled Roy Martin's world junior record of 20.13 s at the Pan-American Junior Championships.^[12][36] This performance attracted interest from the press, and his times in the 200 m and 400 m led to him being touted as a possible successor to Johnson. Indeed, at sixteen years old, Bolt had reached times that Johnson did not register until he was twenty, and Bolt's 200 m time was superior to Maurice Greene's season's best that year.^[34]

In his final Jamaican High School Championships in 2003, he broke both the 200 m and 400 m records with times of 20.25 s and 45.30 s, respectively. Bolt's runs were a significant improvement upon the previous records, beating the 200 m best by more than half a second and the 400 m record by almost a second.^[12]

Bolt was growing more popular in his homeland. Howard Hamilton, who was given the task of Public Defender by the government, urged the JAAA to nurture him and prevent burnout, calling Bolt "the most phenomenal sprinter ever produced by this island".^[34] His popularity and the attractions of the capital city were beginning to be a burden to the young sprinter. Bolt was increasingly unfocused on his athletic career and preferred to eat fast food, play basketball, and party in Kingston's club scene. In the absence of a disciplined lifestyle, he became ever-more reliant on his natural ability to beat his competitors on the track.^[37]

As the reigning 200 m champion at both the World Youth and World Junior championships, Bolt hoped to take a clean sweep of the world 200 m championships in the Senior World Championships in Paris.^[12] Bolt beat all comers at the 200 m in the World Championship trials, but he was pragmatic about his chances and noted that, even if he did not make the final, he would consider setting a personal best a success.^[34][38] However, he suffered a bout of conjunctivitis before the event, and it ruined his training schedule.^[12] Realising he would not be in peak condition, the JAAA refused to let him participate in the finals on the grounds that he was too young and inexperienced. Bolt was dismayed at missing out on the opportunity, but focused on getting himself in shape to gain a place on the Jamaican Olympic team instead.^[38] Even though he missed the World Championships, Bolt was awarded the IAAF Rising Star Award for the 2003 season on the strength of his junior record-equalling run.^[35]

Professional athletics career[link]

Early Professional Career (2004 – 2007)[link]

Under the guidance of new coach Fitz Coleman, Bolt turned professional in 2004, beginning with the CARIFTA Games in Bermuda.^[12] He became the first junior sprinter to run the 200 m in under twenty seconds, taking the world junior record outright with a time of 19.93 s.^[12][26] For the second time in the role, he was awarded the Austin Sealy Trophy for the most outstanding athlete of the 2004 CARIFTA Games.^[39][30][31] A hamstring injury in May ruined Bolt's chances of competing in the 2004 World Junior Championships, but he was still chosen for the Jamaican Olympic squad.^[40] Bolt headed to the 2004 Athens Olympics with confidence and a new record on his side. However, he was hampered by a leg injury and was eliminated in the first round of the 200 metres with a disappointing time of 21.05 s.^[1][41] American colleges offered Bolt track scholarships on the strength of his performances, but the teenager from Trelawny refused them all, stating that he was content to stay in his homeland of Jamaica.^[15] Bolt instead chose the surroundings of the University of Technology, Jamaica, as his professional training ground, staying with the university's primitive track and weight room that had served him well in his amateur years.^[42]

Bolt at the Crystal Palace Meeting in 2007

The year 2005 signalled a fresh start for Bolt in the form of a new coach, Glen Mills, and a new attitude to athletics. Mills recognised Bolt's potential and aimed to cease the sprinter's unprofessional approach to the sport.^[41] Bolt began training with Mills in preparation for the upcoming athletics season, partnering with more-seasoned sprinters such as Kim Collins and Dwain Chambers.^[43] The year began well, and in July he knocked more than a third of a second off the 200 m CAC Championship record with a run of 20.03 s,^[44] then registered his 200 m season's best at London's Crystal Palace, running in 19.99 s.^[1] Misfortune awaited Bolt at the next major event, the 2005 World Championships in Helsinki. Bolt felt that both his work ethic and athleticism had much improved since the 2004 Olympics, and he saw the World Championships as a way to live up to expectations, stating, "I really want to make up for what happened in Athens. Hopefully, everything will fall into place".^[45] Bolt qualified with runs under 21 s, but he suffered an injury in the final, finishing in last place with a time of 26.27 s.^[41][46] Injuries were preventing him from completing a full professional athletics season, and the eighteen-year-old Bolt still had not proven his mettle in the major world-athletics competitions.^[47] Bolt was involved in a car accident in November, and although he suffered only minor facial lacerations, his training schedule was further upset.^[48][49] His manager, Norman Peart, made Bolt's training less intensive, and he had fully recuperated the following week.^[48] Bolt had continued to improve his performances, and he reached the world top-5 rankings in 2005 and 2006.^[12] Peart and Mills stated their intentions to push Bolt to do longer sprinting distances with the aim of making the 400 m event his primary event by 2007 or 2008. Bolt was less enthusiastic, and demanded that he feel comfortable in his sprinting.^[48][50] He suffered another hamstring injury in March 2006, forcing him to withdraw from the 2006 Commonwealth Games in Melbourne, and he did not return to track events until May.^[51] After his recovery, Bolt was given new training exercises to improve flexibility, and the plans to move him up to the 400 m event were put on hold.^[47]

Upon his return to competition, the 200 m remained his primary event, and he beat Justin Gatlin's meet record in Ostrava, Czech Republic. Bolt had aspired to run under twenty seconds to claim a season's best but, despite the fact that bad weather had impaired his run, he was happy to end the meeting with just the victory.^[52] However, a sub-20-second finish was soon his, as he set a new personal best of 19.88 s at the 2006 Athletissima Grand Prix in Lausanne, Switzerland, finishing behind Xavier Carter and Tyson Gay to earn a bronze medal.^[53] Bolt had focused his athletics aims, stating that 2006 was a year to gain experience. Also, he was more keen on competing over longer distances, setting his sights on running regularly in both 200 m and 400 m events within the next two years.^[52] Bolt claimed his first major world medal two months later at the IAAF World Athletics Final in Stuttgart, Germany. He passed the finishing post with a time of 20.10 s, gaining a bronze medal in the process.^[1] The IAAF World Cup in Athens, Greece, yielded Bolt's first senior international silver medal.^[1] Wallace Spearmon from the United States won gold with a championship record time of 19.87 s, beating Bolt's respectable time of 19.96 s.^[54] Further 200 m honours on both the regional and international stages awaited Bolt in 2007. The young Jamaican yearned to run in the 100 metres, but coach Mills diverted his attention, stating that he could run the shorter distance if he broke the 200 m national record.^[41] In the Jamaican Championships, he ran 19.75 s in the 200 m, breaking the 36-year-old Jamaican record held by Don Quarrie by 0.11 s.^[12][15]

Mills complied with Bolt's demand to run in the 100 m, and he was entered to run the event at the 23rd Vardinoyiannia meeting in Rethymno, Crete. In his debut tournament run, he set a personal best of 10.03 s, winning the gold medal and feeding his enthusiasm for the event.^[15][55]

Bolt (second from left) behind Gay in the closing stages of the 200 m race

Bolt (left) on the podium with his silver medal from the 200 m race in Osaka (2007)

He built on this achievement at the 2007 World Championships in Osaka, Japan, winning a silver medal.^[1] Bolt recorded 19.91 s with a headwind of 0.8 m/s but this paled in comparison with Tyson Gay's time of 19.76 s, which set a new championship record.^[56]

The Jamaican national record fell when Bolt partnered with Asafa Powell, Marvin Anderson, and Nesta Carter in the 4×100 metres relay. However, their finish in 37.89 s was not enough to beat the Americans' time of 37.78 s.^[57] Bolt did not win any gold medals at the major tournaments in 2007, but Mills felt that Bolt's technique was much improved, pinpointing improvements in Bolt's balance at the turns over 200 m and an increase in his stride frequency, giving him more driving power on the track.^[41]

World-record breaker[link]

The silver medals from the 2007 Osaka World Championships boosted Bolt's desire to run, and he took a more serious, more mature stance towards his career.^[19] Bolt continued to develop in the 100 m, and he entered to run in the event at the Jamaica Invitational in Kingston. On 3 May 2008, Bolt ran a time of 9.76 s, aided by a tail wind of 1.8 m/s, considerably improving upon his previous personal best of 10.03 s.^[58] This was the second-fastest legal performance in the history of the event; second only to compatriot Asafa Powell's 9.74 s record set the previous year in Rieti, Italy.^[59] Rival Tyson Gay lauded the performance, praising Bolt's form and technique especially.^[60] Michael Johnson, who was observing the race, said that he was shocked at how quickly he had improved over the 100 m distance.^[61] The Jamaican surprised even himself with the time, but coach Glen Mills remained confident that there was more to come.^[60]

Bolt preparing ahead of a race at the 2007 Osaka World Championships

Mills' prediction came true before the end of the month when Bolt established a new 100 m world record on 31 May 2008. Pushed on by a tail wind of 1.7 m/s, Bolt ran 9.72 s at the Reebok Grand Prix held in the Icahn Stadium in New York City, breaking Powell's record.^[62] The record time was even more remarkable in light of the fact that it was only his fifth senior run over the distance.^[63] Gay again finished second and commended Bolt's physical superiority, stating, "It looked like his knees were going past my face".^[15] Commentators noted that Bolt appeared to have gained a psychological advantage over fellow Olympic contender Gay.^[41]

In June 2008, Bolt responded to claims that he was a lazy athlete, saying that the comments were unjustified, and he trained hard to achieve his potential. However, he surmised that such comments stemmed from his lack of enthusiasm for the 400 metres event, and chose to not make the effort to train for distance running.^[64] Turning his efforts to the 200 m, Bolt proved that he could excel in multiple events—first setting the world-leading time in Ostrava, then breaking the national record for the second time with a 19.67 s finish in Athens, Greece.^[65][66] Although Mills still preferred that Bolt focus on the longer distances, the acceptance of Bolt's demand to run in the 100 m worked for both sprinter and trainer. Bolt was more focused in practice, and a training schedule to boost his top speed and his stamina, in preparation for the Olympics, had improved both his 100 m and 200 m times.^[15][67][68] His confidence was building, and he was sure that he would perform well in the upcoming Olympics.^[65]

2008 Summer Olympics[link]

Bolt announced that he would double-up with the 100 metres and 200 metres events at the Beijing Summer Olympics, and the new 100 m world-record holder was the favourite to win both.^[69][70] Michael Johnson, the 200 m and 400 m record holder, personally backed the sprinter, saying that he did not believe that a lack of experience would work against him.^[71] Bolt qualified for the 100 m final with times of 9.92 s and 9.85 s in the quarter-finals and semifinals, respectively.^[72][73][74]

Bolt held a considerable lead over his rivals in the closing stages of the 100 m final.

In the Olympic 100 m final, Bolt broke new ground, winning in 9.69 s (unofficially 9.683 s) with a reaction time of 0.165 s.^[75] This was an improvement upon his own world record, and he was well ahead of second-place finisher Richard Thompson, who finished in 9.89 s.^[76] Not only was the record set without a favourable wind (+0.0 m/s), but he also visibly slowed down to celebrate before he finished and his shoelace was untied.^[77][78][79] Bolt's coach reported that, based upon the speed of Bolt's opening 60 m, he could have finished with a time of 9.52 s.^[80] After scientific analysis of Bolt's run by the Institute of Theoretical Astrophysics at the University of Oslo, Hans Eriksen and his colleagues also predicted a sub 9.60 s time. Considering factors such as Bolt's position, acceleration and velocity in comparison with second-place-finisher Thompson, the team estimated that Bolt could have finished in 9.55±0.04 s had he not slowed to celebrate before the finishing line.^[81][82]

Bolt stated that setting a record was not a priority for him, and that his goal was just to win the gold medal, Jamaica's first of the 2008 Games.^[83] Olympic medalist Kriss Akabusi construed Bolt's chest slapping before the finish line as showboating, noting that the actions cost Bolt an even faster record time.^[84] IOC president Jacques Rogge also condemned the Jamaican's actions as disrespectful.^[85][86] Bolt denied that this was the purpose of his celebration by saying, "I wasn't bragging. When I saw I wasn't covered, I was just happy".^[87] Lamine Diack, president of the IAAF, supported Bolt and said that his celebration was appropriate given the circumstances of his victory. Jamaican government minister Edmund Bartlett also defended Bolt's actions, stating, "We have to see it in the glory of their moment and give it to them. We have to allow the personality of youth to express itself".^[88]

Bolt leads the field in the closing stages of the 200 m final

Bolt then focused on attaining a gold medal in the 200 m event, aiming to emulate Carl Lewis' double win in the 1984 Los Angeles Olympics.^[89] Michael Johnson felt that Bolt would easily win gold but believed that his own world record of 19.32 s set at the 1996 Summer Olympics in Atlanta would remain intact at the Olympics.^[90] Bolt eased through the first and second rounds of the 200 m, jogging towards the end of his run both times.^[91] He won his semifinal and progressed to the final as the favourite to win.^[92] Retired Jamaican sprinter Don Quarrie praised Bolt, saying he was confident that Johnson's record could be beaten.^[35] The following day, at the final, he won Jamaica's fourth gold of the Games, setting a new world and Olympic record of 19.30 s.^[93] Johnson's record fell despite the fact that Bolt was impeded by a 0.9 m/s headwind. The feat made him the first sprinter since Quarrie to hold both 100 m and 200 m world records simultaneously and the first since the introduction of electronic timing.^[93][94] Furthermore, Bolt became the first sprinter to break both records at the same Olympics.^[95] Unlike in the 100 m final, Bolt sprinted hard all the way to the finishing line in the 200 m race, even dipping his chest to improve his time.^[96] Following the race, "Happy Birthday" was played over the stadium's sound system as his 22nd birthday would begin at midnight.^[96]

Two days later, Bolt ran as the third leg in the Jamaican 4x100 metres relay team, increasing his gold medal total to three.^[97] Along with teammates Nesta Carter, Michael Frater, and Asafa Powell, Bolt broke another world and Olympic record, their 37.10 s finish breaking the previous record by three tenths of a second.^[98] Powell, who anchored the team to the finishing line, lamented the loss of his 100 m record to Bolt but showed no animosity towards his Jamaican rival, stating that he was delighted to help him set his third world record.^[99] Following his victories, Bolt donated US$50,000 to the children of the Sichuan province of China to help those harmed by the 2008 Sichuan earthquake.^[100]

Bolt celebrates his victory and world record after the 100 m race in the Beijing National Stadium

Bolt's record-setting runs caused commentators not only to praise his achievements but also to speculate about his potential to become one of the most successful sprinters ever.^[17][101] Critics hailed his Olympic success as a new beginning for a sport that had long suffered through high-profile drug scandals.^{[63][102][dead link]} The previous six years had seen the BALCO scandal, Tim Montgomery and Justin Gatlin stripped of their 100 m world records, and Marion Jones returning three Olympic gold medals.^[103] All three sprinters were disqualified from athletics after drugs tests detected banned substances in their systems.^[104][105] Bolt's record-breaking performances caused suspicion among some commentators, including Victor Conte, and the lack of an independent Caribbean anti-doping federation raised more concerns.^[106][107] The accusations of drug use were vehemently rejected by Glen Mills (Bolt's coach) and Herb Elliott (the Jamaican athletics team doctor). Elliott, a member of the IAAF anti-doping commission, urged those concerned about the issue to "come down and see our programme, come down and see our testing, we have nothing to hide".^[108] Mills had been equally ardent that Bolt was a clean athlete, declaring to the Jamaica Gleaner: "We will test any time, any day, any part of the body...[he] doesn't even like to take vitamins".^[109] Bolt stated that he had been tested four times prior to the Olympics, and all had tested negative for banned substances. He also welcomed anti-doping authorities to test him to prove that he was clean, stating, "We work hard and we perform well and we know we're clean".^[110]

After the Olympics[link]

The end of the 2008 athletics season saw Bolt compete in the ÅF Golden League, beginning in Weltklasse Zürich. Despite having the slowest start among his competitors in the 100 m race, he still crossed the finishing line in 9.83 s.^[112] Even though the time was slower than both his newly set world record and Asafa Powell's track record, it was still among the top-fifteen 100 m finishes by any sprinter to that date.^[77] Bolt admitted that he was not running at full strength, suffering from a cold, but he had concentrated on both winning the race and finishing the season in good health.^[112] At the Super Grand Prix final in Lausanne, Bolt ran his second-fastest 200 m with a time of 19.63 s, equalling Xavier Carter's track record.^[113] However, it was the 100 m final, featuring Asafa Powell, that drew the most interest. Powell had moved closer to Bolt's world record after setting a new personal best of 9.72 s, reaffirming his status as Bolt's main contender.^[114] Bolt's final event of the season came three days later at the Golden League final in Brussels. This was the first 100 m race featuring both Bolt and Powell since the final in the Olympics. Both Jamaicans broke the track record, but Bolt came out on top with a time of 9.77 s, beating Powell by 0.06 s. Victory, however, did not come as smoothly as it had in Beijing. Bolt made the slowest start of the nine competitors and had to recover ground in cold conditions and against a 0.9 m/s headwind.^[115] Yet the results confirmed Jamaican dominance in the 100 m, with nine of the ten-fastest legal times in history being recorded by either Bolt or Powell.^[77] On his return to Jamaica, Bolt was honoured in a homecoming celebration and received an Order of Distinction in recognition of his achievements at the Olympics.^[116]

He was selected as the IAAF Male Athlete of the year and won a Special Olympic Award for his performances.^[117] However, Bolt turned his attention to future events, suggesting that he could aim to break the 400 metres world record in 2010 as no major championships were scheduled that year.^[118]

2009 Berlin World Championships[link]

Bolt (centre) in the starting blocks before his 150 metres world best run of 14.35 seconds

Bolt started the season competing over 400 metres in order to improve his speed, winning two races and registering 45.54 s in Kingston,^[119] and windy conditions gave him his first sub-10 second finish of the season in the 100 m in March.^[120] In late April Bolt suffered minor leg injuries in a car crash. However, he quickly recovered following minor surgery and (after cancelling a track meet in Jamaica) he stated that he was fit to compete in the 150 metres street race at the Manchester Great City Games.^[121] Bolt won the race in 14.35 s, the fastest time ever recorded for 150 m.^[122] Despite not being at full fitness, he took the 100 and 200 m titles at the Jamaican national championships, with runs of 9.86 s and 20.25 s respectively.^[123][124] This meant he had qualified for both events at the 2009 World Championships. Rival Tyson Gay suggested that Bolt's 100 m record was within his grasp, but Bolt dismissed the claim and instead noted that he was more interested in Asafa Powell's return from injury.^[125] Bolt defied unfavourable conditions at the Athletissima meet in July, running 19.59 seconds into a 0.9 m/s headwind and rain, to record the fourth fastest time ever over 200 m,^[126] one hundredth off Gay's best time.^[127]

Bolt (left) during the 200 metres quarter-finals at the 2009 World Championships

At the 2009 World Championships in August, Bolt eased through the 100 m heats, clocking the fastest ever pre-final performance of 9.89 seconds.^[128] The final was the first time Bolt and Gay had met in the season, and Bolt improved his world record with a time of 9.58 s to win his first World Championship gold medal. Gay finished with a time of 9.71 s, 0.02 s off Bolt's 9.69 s world-record run in Beijing.^[129] Taking over a tenth of a second off the previous best mark, this was the largest ever margin of improvement in the 100 m world record since the beginning of electronic timing.^[130]

Although Gay withdrew from the second race of the competition, the Jamaican once again produced world record-breaking form in the 200 metres final. He broke his own record by 0.11 seconds, finishing with a time of 19.19 seconds.^[131] He won the 200 m race by the biggest margin in World Championships history, even though the race had three other athletes running under 19.90 seconds, the greatest number ever in the event.^[132][133] Bolt's pace impressed even the more experienced of his competitors; third-placed Wallace Spearmon complimented his speed,^[134] and former Olympic champion Shawn Crawford said "Just coming out there...I felt like I was in a video game, that guy was moving – fast".^[135] Bolt pointed out that an important factor in his performance at the World Championships was his improved start to the races: his reaction times in the 100 m (0.146)^[136] and 200 m (0.133)^[137] were significantly faster than those he had produced in his world record runs at the Beijing Olympics.^[138][139] However, he, together with other members of Jamaican 4x100 m relay team, fell short of their own world record of 37.10 s set at 2008 Summer Olympics by timing 37.31 s, which is, however, a championship record and the second fastest time in history at that date.^[140]

Bolt beating all opposition and setting a 100 m world record

On the last day of the Berlin Championships, the governing Mayor of Berlin, Klaus Wowereit, presented Bolt with a 12-foot high section of the Berlin Wall in a small ceremony, saying Bolt had shown that "one can tear down walls that had been considered as insurmountable." The nearly three-ton segment will be delivered to Bolt's training camp in Jamaica.^[141]

Several days after Bolt broke the world records in 100 and 200 metres events, Mike Powell, the world record holder in long jump (8.95 metres set in 1991) argued that Bolt could become the first man to jump over 9 metres, the long jump event being "a perfect fit for his speed and height".^[142] At the end of the season he was selected as the IAAF World Athlete of the Year for the second year running.^[143]

2010: Diamond League and broken streak[link]

Early on in the 2010 outdoor season, Bolt ran 19.56 seconds in the 200 m in Kingston, Jamaica for the fourth-fastest run of all-time, although he stated that he had no record breaking ambitions for the forthcoming season.^[144] He took to the international circuit May with wins in East Asia at the Colorful Daegu Pre-Championships Meeting and then a comfortable win in his 2010 IAAF Diamond League debut at the Shanghai Golden Grand Prix.^[145][146] Bolt made an attempt to break Michael Johnson's best time over the rarely competed 300 metres event at the Golden Spike meeting in Ostrava. He failed to match Johnson's ten-year-old record of 30.85 and suffered a setback in that his 30.97-second run in wet weather had left him with an Achilles tendon problem.^[147][148]

On his return from injury a month later, he asserted himself with a 100 m win at the Athletissima meeting in Lausanne (9.82 seconds) and a victory over Asafa Powell at Meeting Areva in Paris (9.84 seconds).^[149][150] Despite this run of form, he suffered only the second loss of his career in a 100 m final at the DN Galan. Tyson Gay soundly defeated him with a run of 9.84 to Bolt's 9.97 seconds, and the Jamaican reflected that he had slacked off in training early in the season while Gay had been better prepared and in a better condition.^[151] This marked Bolt's first loss to Gay over 100 m, which coincidentally occurred in the same stadium where Powell had beaten Bolt for the first time two years earlier.^[152]

2011 Daegu World Championships[link]

Considered the overwhelming favourite to win in the 100 metres at the 2011 World Championships in Daegu, Bolt was eliminated from the final for a false start.^[153] Usain Bolt's countryman, Yohan Blake won in a season best of 9.92 seconds. In the 200m, Bolt cruised through to the final which he won in a time of 19.40s,^[154] the fastest time in history never to be a World Record. Bolt also won gold in 4x100 metres relay with team Jamaica setting a world record time of 37.04.

Personal life[link]

Bolt striking his signature "To Di World"^[155] pose

Bolt expresses a love for dancing and his character is frequently described as laid-back and relaxed.^{[19][156][dead link][157]} Bolt's Jamaican track and field idols include Herb McKenley and former Jamaican 100 m 200 m world record holder, Don Quarrie. Michael Johnson, the former 200 m world and Olympic record holder, is also held in high esteem by Bolt.^[19] The first sport to interest him was cricket and he said if he was not a sprinter he would be a fast bowler instead.^[19] As a child he was a supporter of the Pakistani cricket team and admired the bowling of Waqar Younis.^[158] He is also a fan of Indian batsman Sachin Tendulkar, West Indian opener Chris Gayle^[159] and Australian opener Matthew Hayden.^[160] During a charity cricket match Bolt clean-bowled Chris Gayle. Gayle was complimentary of Bolt's pace and swing.^[161] Bolt also struck a six off Chris Gayle's bowling. Another bowler complimentary of Bolt's pace was former West Indies fast-bowling great Curtly Ambrose.^[162]

Bolt has also expressed his love for football and is a fan of Manchester United as well as Real Madrid.^[163] Bolt has also declared he is a fan of Dutch striker Ruud van Nistelrooy.^[164] Following a race in Manchester, he met the team at their training ground and offered Portuguese national Cristiano Ronaldo some sprinting advice.^[165] Bolt was a special guest of Manchester United at the 2011 UEFA Champions League final in London, where he stated he'd like to play for them after he retires.^[166]

In 2010, he also revealed his fondness of music, when he played a reggae DJ set to a crowd in Paris.^[167]

Sponsorships and advertising work[link]

After winning the 200 m title in the 2002 World Junior Championships in Kingston, Jamaica, Bolt signed a sponsorship deal with Puma.^[168] To promote Bolt's chase for Olympic glory in the 2008 Summer Olympics in Beijing, China, Puma released a series of videos including Bolt's then-world-record-setting run in Icahn Stadium and his Olympic preparations.^[169] After his world record breaking run in New York City, which was preceded by a lightning storm,^[170] the press frequently made puns on the Jamaican's name, nicknaming him "Lightning Bolt" and the "Bolt from the blue".^{[171][172][173][dead link]} During the Beijing 2008 100 m final, Bolt wore golden Puma Complete Theseus spikes that had "Beijing 100 m Gold" emblazoned across them.^[174] His athletics agent is PACE Sports Management.^[175]

In January 2012, Usain Bolt impersonated Richard Branson in a Ad Campaign for Virgin Media.^[176] The multi-million pound campaign was directed by Seth Gordon and features Virgin founder Branson to promote its superfast broadband service. In March 2012, he starred in an ad for Visa and the London 2012 olympics.^[177]

Book Deal[link]

In 2010, Bolt signed a lucrative publishing deal with HarperCollins for an autobiography, which was negotiated by Chris Nathaniel of NVA Management.^[178] This is scheduled for release in 2012. During a press conference in Paris on 15 July 2010, Bolt declined any comment on what would be contained within the book saying, "you can't really give away anything in your book ... should be exciting, it's my life, and I'm a cool and exciting guy".^[163]

Recognition[link]

As a result of Bolt's successes in athletics, he was named the Laureus World Sportsman of the Year for 2009 and 2010.^[179][180]

• IAAF World Athlete of the Year: 2008, 2009
• Track & Field Athlete of the Year: 2008, 2009
• Laureus World Sportsman of the Year: 2009, 2010
• BBC Overseas Sports Personality of the Year: 2008, 2009

Statistics[link]

Personal bests[link]

Event	Time (seconds)	Venue	Date	Records	Notes
100 metres	9.58	Berlin, Germany	16 August 2009		Also shares the second fastest time of 9.69 with Tyson Gay. Bolt's 9.69 set the Olympic record in 2008.
150 metres	14.35	Manchester, United Kingdom	17 May 2009	World best[5]	He ran the last 100 m in 8.70, the fastest ever recorded time over a 100 m distance. This would equal an average speed of 41.38 km/h.
200 metres	19.19	Berlin, Germany	20 August 2009		Also holds the Olympic Record with 19.30, at the time (2008) a new world record.
300 metres	30.97	Ostrava, Czech Republic	27 May 2010		This is the second fastest time, behind Michael Johnson's 30.85.
400 metres	45.28[12]	Kingston, Jamaica	5 May 2007
4 × 100 metres relay	37.04	Daegu, South Korea	4 September 2011		Shared with Yohan Blake, Michael Frater and Nesta Carter.

Records[link]

The progression of Bolt's 200 m seasons' best times^[181]

The progression of Bolt's 100 m seasons' best times^[181]

Bolt's personal best of 9.58 seconds in the 100 metres is the fastest ever legal time.^[77] Bolt also holds the second fastest time of 9.69 seconds (more precisely 9.683),^[75] the current Olympic record.^[77] Tyson Gay recorded a time of 9.68 s at the 2008 US Olympic Trials, but was aided with a tail wind of 4.1 m/s, exceeding the legal limit of 2.0 m/s set by the IAAF and nullifying its inclusion as a world record.^[182] Obadele Thompson's run of 9.69 s in 1996 is also not recognised as it was aided by a 5.0 m/s tail wind.^[77]

Bolt's personal best of 19.19 s in the 200 metres is the world record. This was recorded at the 2009 World Championships in Athletics in Berlin against a headwind of −0.3 m/s. He has also broken the Olympic record with a time of 19.30 s (more precisely 19.296 s)^[183]

The Jamaican relay team including Bolt, set the 4x100 metres world and Olympic records at the 2008 Olympics with a time of 37.10 seconds. This is the only run in the IAAF top ten performances which was not set by an American team.^[184]

Bolt also holds the 200 metres world teenage best results for the age categories 15 (20.58 s), 16 (20.13 s, world youth record), 17 (19.93 s) and 18 (19.93 s, world junior record).^[75] He also holds the 150 metres world best set in 2009, during which he ran the last 100 metres in 8.70 seconds, the quickest timed 100 metres ever.^[75]

Average speed[link]

From his record time of 9.58 s for the 100 m sprint Usain Bolt's average ground speed equates to: 37.58 km/h or 23.35 mph. However, once his reaction time of 0.15 s is subtracted, his time is closer to 9.43 s, making his average speed closer to 38.18 km/h or 23.72 mph.^[185]

Honours[link]

See also[link]

References[link]