(Video Link)
I can't find any reliable information about this video or the sport of ladder racing. Participants run with ladders toward a wall, climb up one segment, hook the ladders on a higher segment, and repeat the process. It certainly appears to be physically demanding.
via reddit
Article can be found here: http://tiny.cc/k5b31
Nice idea, but just don't go making your own hook ladders to scale sky scrapers as there's a lot of hidden safety measures in this vid and the guys doing it are apparently former Cirque du Soleil employees.
http://www.neatorama.com/2010/07/29/pomparkour-ad/