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The biological reasoning behind our favorite pre-race laxative

Everything you need to know about training under tricky circumstances and winning big European mountain races

Three highlights from the opening weekend at the IAAF World Championships

The boom in trail and ultrarunning has already prompted a number of talented track athletes to try their hand at the sport. The results have been telling.

It threatens to overshadow this weekend’s World Championships

But don't worry—a stateside version of Europe's grueling Skyrunning series is ready to kick your ass

Thanks to freezing temps, stringent rules, and nasty winds, the Antarctica Marathon, held every March on the world's largest ice sheet, is every bit as brutal as it sounds

The track star’s name is everywhere these days, but what’s the big deal?

A primer from overall winner of the Canadian Death Race, Alissa St. Laurent