Pushing the Limits: Skyrunning
If you think running a marathon is a feat in itself, imagine doing an ultramarathon up a mountain. At The Rut Mountain Race in Big Sky, Montana, nearly 400 athletes from around the world gathered to compete across 31 miles. They cover more than 10, 000 feet of elevation. The sport is known as As part of the CBS This Morning series, Pushing the Limits, we take a look at the worlds elite athletes who are getting their highaltitude adrenaline rush.
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