I came across some really cool videos on Parkour and Freerunning. Parkour is basically the skill or sport of clearing objects and moving quickly when chasing or running away. Parkour is basically about various vaulting techniques, landing safetly from very high drops, and landing precisely on very small surfaces. Freerunning is Parkour, except instead of trying to use the most energy efficient techniques, they try to make it look cooler by adding spins and flips, etc.

This is a good video to give you a taste:

And this is a good video to give you an idea of how they practice:

It reminds me a lot of the jumping games we used to play as kids, but taken to extremes.