WEST YELLOWSTONE, Mont. – The distance course on the South Plateau wasn’t too bad if you didn’t think about it too much. The 9-kilometer freestyle race – the first of the 2012/2013 U.S. SuperTour series – netted a slight elevation gain of about 300 feet from start to finish. A course profile indicated that the terrain was rolling. No problem. Try racing it. The individual start began around 7,260 feet above sea level, which is...