A short while ago, I was watching a video from the Red Bull Rampage – a freeride downhill mountain biking competition. The location is near Virgin, Utah on the dramatic mesas overlooking the Virgin River that flows through Zion National Park. Looking down from the top of the course is a dizzying experience. The course descends several hundred feet on a narrow spine of sandstone. On either side are near vertical drops. For the uninitiated, it is nearly inconceivable that humans would want to ride down from this cliff edge, but they do backflips, 360 degree rotations, or superman style – feet off the pegs flights into space to land on a slope of dirt, rock and sand and then drop into the next section. The video does not typically show the crashes. Watching the riders drop off the edge of a cliff is terrifying enough.