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 ...

Runner Stephanie Case completed the 100-kilometer (62 miles) Ultra-Trail Snowdonia ultramarathon in 16 hours and 53 minutes, winning a race that also involves over 21,000 feet of climbing. Adding to ...

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 ...

I am not a natural-born runner, but I ran my first ultramarathon just before turning 50. Here’s how I finally got consistent and learned to love running.

Joasia Zakrzewski accepted a trophy for third place in an ultramarathon race. But she used a car for about 2.5 miles of it, a panel found.

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 — ...

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, ...

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