Distance runner Ashley Paulson of St. George has set a world record in the 100-mile ultramarathon. Friday night, the 44-year-old Paulson won the women's division of the Jackpot 100 Mile Ultra National ...

Maybe you jog for exercise. Maybe you've run 10Ks or marathons. But you haven't run nearly as far as this Utah man. Despite all odds, Eric Johnson has really gone the distance.

Add Yahoo as a preferred source to see more of our stories on Google. Scientists have long hypothesized about a theoretical limit to human energy use. Yet elite endurance athletes are constantly ...

From muscle fibers to mental grit, here’s the science behind why some bodies can endure ultramarathons, while others hit the wall far sooner. Ultramarathons sit at the far edge of what the human body ...

The marathon aims to attract world-class runners to the trails of Aroostook County and put the region on an international stage.

Add Yahoo as a preferred source to see more of our stories on Google. United States ultramarathon runner Courtney Dauwalter runs through the mountains near Twin Lakes, Colorado. Dauwalter sits at the ...

In the sport of ultrarunning, athletes often defy human limits. But at a recent 100-kilometer race in Wales, one runner took it to another level. As seen in photos that quickly went viral, runner — ...

Middle-distance runs on mixed Peak District terrain reveal a shoe that feels purposeful – but not without compromise ...

After 195 miles of running, women outpace men. Experts say estrogen plays a key role in the performance boost.

Running extreme distances may strain more than just muscles and joints. New research suggests ultramarathons can alter red blood cells in ways that make them less flexible and more prone to breakdown, ...

As amateur runners swap city roads for brutal mountain peaks, India’s ultra-running culture is reaching new heights ...