If you haven’t heard of SKIMO, then you’ve probably been living under a rock. It’s part masochism, part thrill seeking, and all the things endurance athletes love. To summarize simply, one skis UP a mountain, then one skis DOWN a mountain. The challenge in the uphill is the part where cyclists and trail runners love to show their fitness, and the downhill is where skiers and thrill seekers get to carve fast and lazy turns. And then guess what, they do it again, and again, and again!