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, ...

Running is good for your health, but pushing it too far can take a hidden toll. New research shows that ultramarathons may ...

Runners are still everywhere, but nowadays, not all of them want to stay on the road — or even on the trail. So, off the beaten path they go, and the distances are climbing to crazy heights as well.

A growing crowd of ultramarathon “runcation-ers” say there’s no way to experience a new place like running—or hiking, or walking or limping—a really, really long way through it. For spectators, some ...

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 100 Marathon Club is one of the world’s most exclusive. So exclusive, in fact, that 11 times more people have climbed Everest than have been admitted as members. All of those 657 full members have ...

Running 170 kilometres over mountainous terrain caused people's red blood cells to accumulate more age-related damage than those of less ambitious athletes ...

Nowadays, running around the track, around the block, or even around town is not enough for some runners. For some, only ultramarathons will do. Mostly off-road, and sometimes off-trail, ...