The Asylum Ultramarathon was held on a 4.5-mile trail loop and continued until there was one runner left.
Check out this gallery from the 2014 UROC 100K in Copper Mountain, Colorado.
A 100-mile race isn't out of reach—if you prepare properly.
The medics at ultramarathons get a first-hand look at where races go wrong. Here is their advice to get you to the finish line. When it
Badwater Ultramarathon champion Harvey Lewis has a penchant for endurance-related adventures.
The apparel and footwear company is now associated with one of the world's toughest ultras.
Leo Lightner started running in his 50s and now competes in marathons and ultramarathons.
He did it in a year.
He was raising money for penguin conservation.