Ultrarunning

A new study shows that very long, very hard races hurt and replenish red blood cells in ways that could potentially help treat cancer patients.

The Tokyo bronze medalist earned a Golden Ticket into Western States in just her second ultra—but not without baptism by fire.

Sébastien Raichon earns a "fun run" amid heinous conditions. But for the 26th time, there are no finishers.

What started as a monthlong challenge in Tempe, Arizona, to win a year's worth of free burritos turned into a worldwide sensation with 115 participating cities and over 17,000 runners overnight. The reason has very little to do with beans and cheese.

In the past year, Courtney Olsen has set a world record, an American record, won a national championship, and ran 2:35 at the Houston Marathon. There’s just one problem.

The ultrarunning legend has won everything many times over. But winning, she said after recently finishing a 100-miler despite ongoing health woes, was never the point.

In a historic record-breaking season across distances and disciplines, eight runners rose above the rest.

Indigenous communities have long used distance running as a way to pray, give thanks to the land, and move with purpose. Done respectfully, a prayer run could add meaning to your routine.

Running beyond 26.2 doesn't have to be as spooky as it sounds. Coach Dan England breaks down the most common mistakes, and what to do instead.