Free running or “urban acrobatics” is a sport in which a person uses the city environment to leap, run, swing, and move quickly through the landscape in an acrobatic way. The moves in free running are almost death defying to the spectator but the runner elegantly uses the obstacles and environment to enhance their free run.
Parkour is an ancestor of free running and is based on military training. Free running is much more acrobatic in nature than parkour.
World Free Running Parkour Federation
Has an academy, certification opportunities, and list of competitions throughout the world.
The American version of Parkour with an academy and store.