High-altitude mountain running, also known as skyrunning, is one of the most challenging settings for a runner to compete in.
by Competitor.com, Published Sep. 14, 2014, Updated Sep. 15, 2014 at 4:15 PM UTC
Photos from The Rut 50K, one of the hardest trail races in the U.S.
by Duncan Larkin, Published Aug. 21, 2013, Updated Aug. 21, 2013 at 8:59 AM UTC
The Swedish runner burst onto the scene in the past year.
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