Out of all the ridiculous, exciting new sports out there, none might be as thrilling — or as dangerous — as parkour.
Parkour, also known as freerunning, basically involves just exploding your body off any kind of surface. Style trumps all, and objects exist only as obstacles or, better yet, launching pads.
And another great thing about parkour is that the only thing someone needs to get started is a city block.
Maybe hold off a while before trying any flips, though.