For decades, elite runners have traveled the world to train at high altitude. When oxygen levels in the air are low, the body ...

A recent study delves into the science, but doctors say there’s more to it.

After a long trail race, some of your red blood cells may not bend the way they should. That matters because red blood cells have a tight job description.

Scientists have long known that people living at high altitudes, where oxygen levels are low, have lower rates of diabetes than people living closer to sea level. But the mechanism of this protection ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Research shows that anything from walking to strength training may add years to your life, underscoring ...