Parkour.

Have you heard of it?  The definition, according to Wikipedia.com is:

"Parkour is the non-competitive sport originating in France of traversing mainly urban landscapes by running, climbing and jumping. Participants run along a route, attempting to navigate obstacles in the most efficient way possible, using only their bodies. Skills such as vaulting, rolling, swinging and wall scaling are employed. Parkour can be practiced anywhere, but areas dense with obstacles are preferable and it is most commonly practiced in urban areas."

Chances are, you may have tried a little Parkour yourself, but never realized it.  Take a look at this video. Can you imagine the muscle this guy has?

And if you're Michael Scott, former Dunder Mifflin Regional Manager, this is your Parkour:

And the full scene:

Please don't try this at home!