Cycling, also called bicycling or biking, is the use of bicycles for transport, recreation, or for sport. Persons engaged in cycling are cyclists or bicyclists. Apart from ordinary two-wheeled bicycles, cycling also includes riding unicycles, tricycles, quadracycles, and other similar human-powered vehicles (HPVs).

Bicycles were introduced in the 19th century and now number about one billion worldwide. They are the principal means of transportation in many regions.

Cycling is a very efficient and effective mode of transportation optimal for short to moderate distances. Bicycles provide numerous benefits compared to motor vehicles, including exercise, an alternative to the use of fossil fuels, no air or noise pollution, much reduced traffic congestion, easier parking, greater maneuverability, and access to both roads and paths. The advantages are at less financial cost to the user as well as society (negligible damage to roads, and less pavement required). Criticisms and disadvantages of cycling include reduced protection in crashes, particularly with motor vehicles, longer travel time (except in densely populated areas), vulnerability to weather conditions, difficulty in transporting passengers, and the skill and fitness required.

Mark Anthony Martin (born January 9, 1959) is an American stock car driver. He currently drives the #55 Aaron's Toyota for Michael Waltrip Racing in the NASCAR Sprint Cup Series on a part time basis. He has the second most wins in the Nationwide Series with 49. He has finished second in the Sprint Cup Series standings five times and has been described by ESPN as "The best driver to never win a championship."

Martin began his racing career as a young man on the dirt tracks of Arkansas. He moved on to asphalt racing and joined the ASA racing series. During his ASA career, Mark raced against Dick Trickle, Jim Sauter, Joe Shear and Bobby Allison. Mark went on to earn Rookie of the Year in 1977. Mark rounded out his ASA career winning twenty-two races and four championships (1978, 1979, 1980, and 1986).

Martin had a tumultuous beginning in NASCAR, driving for six different teams from 1981 to 1987. He made five starts in 1981 driving for Bud Reeder, earning two pole positions at Nashville and Richmond and finishing third in his final race at Martinsville.