Aspen Snowmass, for the seventh year in a row, is scheduled to host the Audi Power of Four Ski Mountaineering Race Saturday, Feb. 25. For athletes not quite ready to take on the full course, participants have the option to race the Power of Two that covers the last two mountains of the full route, Aspen Highlands and Aspen Mountain. The Audi Power of Four Ski Mountaineering Race is the winter edition of the Power of Four series that includes both a bike and run race in the summer.