"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." YOU MIGHT KNOW them as the “powerhouses of the cell,” but that’s selling mitochondria short—these ...

Barefoot running isn’t a trend—it’s a return to the most natural way the human body was designed to move. Without cushioned shoes, the feet are forced to work as intended, activating muscles and ...

Ultra-endurance athletes can push their bodies to extraordinary extremes, but even they run into a hard biological wall. Researchers tracked ultra-runners, cyclists, and triathletes over weeks and ...