get into parkour :D
I was going to suggest this, but I haven't even gotten into it, and from it looks of it, it looks kinda dangerous.
But apparently it feels really natural, and you don't start off by up running up walls and jumping across high stuff.
I heard that you just start out with vaults and whatnot, and eventually you get skilled enough in moving around like that that you can just do stuff easily.
It also makes life like a video game, where you can just jump over stuff and do crazy stunts and whatnot, which seems pretty sweet to me. I'd practice it if my left hip didn't hurt so bad and whatnot. :p