Hardcore endurance athletes have tracked the metric for decades, but it is increasingly touted as a measure of fitness and health for the average person.

Six-pack abs don't always show a picture of health. But getting a read on the maximum oxygen your body takes in while exercising can be key for long-sustaining health. The technology to test oxygen ...

Your VO2 max—a measure of strength—can tell you a lot about how you’re aging. Here’s how to calculate it without going to a ...

New testing in maternal hyperoxia — giving extra oxygen to pregnant people — shows that prenatal interventions might yield ...