What is... Parkour?
Sometimes called "freerunning," you will probably be most familiar with the concept if you've seen Casino Royale.
Remember the crazy bombmaker in Africa who leads Bond on a merry chase out of a mongoose/cobra fight through a construction site, and into a foreign embassy? Parkour.
It's French. (Like Savate.) And it is acrobatic. (Like Savate.) And it looks "goofy-cool." (Like Savate.) [Ok, that last one includes a little gem called "le canne." French stick fighting technique based on fencing movements. But that's a topic for another day. BTW, consider the speed being utilized in the Savate and Le Canne. FAST!]
I don't suggest you try parkour at home, or if you are over the age of 25. Too hard on your lower joints. You'll be needing those later. Stay home, watch a nice movie.