Parkour
After reading the New Yorker piece on parkour from last year I hopped over to YouTube and watched a few videos of David Belle (who invented parkour) that were worth sharing: a short “best of”, his most famous fall (which is described in the article) and a BBC commercial he did.

Hi, I'm 
i remember thinking when this article came out how curious it is that parkour (of which i am a fan, albeit not a practioner, except running for the 6 train from time to time) has been for the last 10+ constantly about to break out, but never quite doing so.
that said, district b13 is a lot of fun, and parkour has built up an interesting global community around itself that is rightly, considering its roots, always just underground.
once you make parkour mainstream, it becomes this
Yeah, I guess I hadn’t thought about it, but it’s amazing it’s not bigger (except for all the danger). What is distric b13?