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The Power of Four Ski Mountaineering Race in Aspen, Colorado a couple of weeks ago was an adventure into the physiologic unknown for me. Sure, I've done plenty of exercise of that duration and longer. I've also gone just as hard for periods of time. But I've never really combined that kind of duration with that kind of focused effort. There just aren't competitive events of that length happening that often. I think endurance mountain bike racing will be the venue for similar efforts as that sport continues its growth but since I don't own a mountain bike right now, those races pass me by.


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