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Walking (also known as ambulation) is one of the main gaits of locomotion among legged animals, and is typically slower than running and other gaits. Walking is defined by an 'inverted pendulum' gait in which the body vaults over the stiff limb or limbs with each step. This applies regardless of the number of limbs - even arthropods with six, eight or more limbs.

The word walk is descended from the Old English wealcan "to roll". In humans and other bipeds, walking is generally distinguished from running in that only one foot at a time leaves contact with the ground and there is a period of double-support. In contrast, running begins when both feet are off the ground with each step. This distinction has the status of a formal requirement in competitive walking events. For quadrupedal species, there are numerous gaits which may be termed walking or running, and distinctions based upon the presence or absence of a suspended phase or the number of feet in contact any time do not yield mechanically correct classification. The most effective method to distinguish walking from running is to measure the height of a person's center of mass using motion capture or a force plate at midstance. During walking, the center of mass reaches a maximum height at midstance while during running, it is at a minimum. Definitions based on the percent of the stride during which a foot is in contact with the ground (averaged across all feet) of greater than 50% contact corresponds well with identification of 'inverted pendulum' mechanics and are indicative of walking for animals with any number of limbs, although this definition is incomplete. Running humans and animals may have contact periods greater than 50% of a gait cycle when rounding corners, running uphill or carrying loads.

Norman Mark Reedus (born January 6, 1969) is an American actor. He is perhaps best known for his portrayal of Murphy MacManus in the 1999 film The Boondock Saints as well as its 2009 sequel The Boondock Saints II: All Saints Day and for the character of Daryl Dixon in the AMC television series The Walking Dead. He has also directed several videos and modeled for various fashion designers.

Reedus was born on January 6, 1969 in Hollywood, Florida and months later moved to Los Angeles, California. He also spent some time living in Japan, England and Spain.

While in Los Angeles, he worked at a Harley Davidson shop in Venice and at the same time contributed artwork to various shows as a painter, photographer, sculptor, and video artist. He got his first taste of acting in the play Maps for Drowners at the Tiffany Theater on Sunset Boulevard. He was first discovered at a party in Los Angeles where he started screaming with giant sunglasses on, until someone asked if he wanted to be in a play.

His first film was in 1997 the Guillermo del Toro horror thriller film Mimic, where he played the character Jeremy. He was 28 at the time. He has also played roles in the films Floating, Six Ways to Sunday, Deuces Wild, Blade II, Gossip, 8mm, American Gangster, Hero Wanted and Moscow Chill. In 2005 he had a bit-part in the Christian Alvart German film Antibodies as a German Polizist (policeman). In 2008 he starred in the film Red Canyon as the character of Mac.