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 — ...

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 ...

Paul Johnson, a veteran and ultra runner, is known for his running adventures, like running across America and beating world running records in places like Antarctica. Now he's on his way to beating ...

In Ghent, Belgium, on the last day of 2024, Belgian ultra runner and bioengineer, Hilde Dosogne, crossed the finish line cheered on by a sea of spectators. Hilde Dosogne set out to smash the Guinness ...

Scientists provide proof that ultramarathon athletes’ red blood cells become less flexible after a long race, potentially reducing their ability to efficiently carry oxygen ...

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 ...

My roommate and I had the luck of choosing the exact same trail as the Santa Barbara Nine Trails Endurance Run on the same hot Saturday morning. We were headed in the opposite direction, and only ...

Backyard ultras already have a reputation for being unconventional, but Frankie’s Vertical Backyard Ultra is taking things a ...

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.

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

The extreme sport of ultrarunning is known for seemingly impossible feats. But Stephanie Case's recent performance — six months after giving... Ultramarathon runner breastfeeds her baby 3 times on her ...