While skis are made for mountains, a few only find them useful in cities. These "street skiers" dedicate their lives to pushing the limits of what is possible on skis in urban environments. Jumping off four story buildings, flying into 50 ft high dams, flipping over staircases; these are some of the most daring athletes in the world. This bizarre sport seems like all fun and games, but then horrific injuries, relentless illegal behavior, and their "at all costs" mentality shows that, to them, th...