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The danger of over-hydrating during an endurance race.
Tim Johnson on how he conquered one of America's mightiest peaks.
5K race displays your relationship status on your bib.
We spoke to Jed Mildon after he landed the quadruple backflip.
In "nature's toughest challenge," runners race around Mont Blanc.
Should You Do a Tough Mudder, Spartan Race, or Warrior Dash?
A down-and-dirty guide to the best obstacle racing gear.
You need to train right to ace this race. We show you how.