goat the bottom of the track. >> when you are straight bombing it, you have to flirt with the line of whether you are going to bomb or make noit the finish line. >> reporter: are it was all created on a whim. >> the story goes that a couple of guys had some bar in alps somewhere and they came out and the streets were frozewen ice and bumping with each other, and one said, what if we froze the streets and fut hockey player on it. >> reporter: an extreme sport was born and two decades later, it is a world class series of races called red bull crash ice. >> now it is a sport that guys are training year-round about it and ten-stop world tour. >> reporter: the rules are simple. four skaters flying down the manmade track hitting speeds of 50 miles per hour. first to the bottom wins. >> the first jump you have to clear about 35 feet to hit the landing. we have a crazy s-turn coming around which is chaos, and the g