Parkour (Freerunning), (French pronunciation: [paʁˈkuʁ]) (abbreviated PK) is a training discipline that developed out of military obstacle course training.
Practitioners aim to move from one place to another, negotiating the obstacles in between. The discipline uses no equipment and is non-competitive. A male practitioner is generally called a "traceur", a female a "traceuse".
Developed by Raymond Belle, David Belle, Sébastien Foucan and other members of the original Yamakasi group, parkour became popular in the 1990s and 2000s through a series of documentaries and films featuring these practitioners and others.
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http://en.wikipedia.org/wiki/Parkour