Parkour

Pretty Cool stuff..
http://tysoncecka.com/production

At first glance it looks like some guys got bored in the urban environment and started getting creative, but a quick view at the wiki :
http://en.wikipedia.org/wiki/Parkour

gives a detailed history of the art of moving as efficiently as possible from one place to the next.

Now if only I had ankles like this guy I'd be set!
Good stuff on youtube as well..