Ah, yes - It's an extreme sport known as free-running: It treats man-made structures as an obstacle course that participants negotiate by daring feats of graceful gymnastics. It was invented by a group of childhood friends in Lisses, near Paris in the 1980s, when Sebastien Foucan, David Belle et al created what they call
le parkour (a deliberately un-French spelling to make the point that they were doing something different).
Unlike other extreme activities, it has developed a philosophy. “It is not just a game,” Sebastien Foucan is quoted as saying, “it is a discipline because it is a way of facing our fears and demons that you can apply to the rest of your life.”
Anyone interested can learn the moves here: :wink:
http://www.urbanfreeflow.com/fundamentals/fundamentals.htm
For the more sedantry amongst us, try the dvd "Jump London" or the film that Luc Besson made with the originators of the movement, called "Yamakasi".