On TikTok, VO2 max is going viral as the key to improving your endurance during a workout. In short, you can think of this metric as the maximum amount of oxygen your body uses during exercise ...

This measurement of how efficiently your body uses oxygen during exercise is one of the first fitness markers to decline. You might notice yourself getting winded climbing stairs that didn’t ...

The test requires wearing a face mask over your mouth to measure your oxygen consumption and carbon dioxide production during cardiovascular exercise, like running on a treadmill.