Maybe your smartwatch has been telling you your VO2 max for a while now, but you’re not sure how accurate it is. Or maybe you’ve recently been targeted by social media ads for fancy running labs ...

For those unfamiliar, VO2 max might sound like the latest performance-enhancing supplement, but it’s actually the term used ...

V02 max—the measure of how efficiently your body utilizes oxygen during exercise—is widely considered to be the definitive indicator of cardiovascular fitness. However, this powerful metric remains ...