Check out the images from this grueling off-trail event with natural obstacle challenges.
Cody Moat will be a top contender in the 2014 Spartan Race World Championships.
The epic trail race took place last weekend in Steamboat Springs, Colo. Here are photos from the event.
There's no better way to see America the Beautiful than during a run.
U.S. women earn bronze, men finish fourth in Italy.
Photos from The Rut 50K, one of the hardest trail races in the U.S.
The Fitz and the Tantrums drummer gushes about trail running.
Think you have what it takes to complete this grueling race?
Check out these well-known challenges that runners take on in our national parks.