Thats some ass-kicking French hip-hop in the background..
What made me grin: the commenter who said, "he should spend some of his concentration on sprucing up the neighbourhood - bleeaaak.."
This is a whole trend tho, isnt it, now? Like, urban climbing? One of those new extreme sports? Kids using the towerblocks and buildings to do the craziest jumping stunts.. there's a word for it, forget what it is.
I saw that French movie, Yamakasi, a coupla years ago - bout these tough kids (with golden hearts, of course) from the banlieues doing that crazy jumping and climbing stuff.. and then getting into trouble and into a spectacular burglary raid on some fancy bad guy house in genteel central Paris, of course - jumping all over the place, ceilings, walls - that was a cool effin movie.
Anyways, that stuff is a whole urban subculture thing now, apparently.