Learn more about the impact ultramarathon running has on red blood cells and how it may do more harm than good for the body.

Ultrarunning is an existential journey. What do we learn at mile 30 or 50 or 99? We learn that we are layers of self-aware ...

A marathon is a big challenge, no doubt, but once you’ve done one, or even several, where do you go next? How about running even further and earning the title of ultrarunner? This booming format is ...

Extreme endurance running damages red blood cells in ways that may affect their ability to function properly, according to a study published in the American Society of Hematology's journal Blood Red ...

Ultramarathons might push red blood cells past their limits—accelerating their aging in the process.

Given the long distance of these competitions, ultra-endurance athletes have to think about food they can carry. There are ...