This easy test can help you get a gauge on your VO2 max—without a watch.

When it comes to understanding your fitness and overall health, VO2 max is often heralded as the most important metric. So if you notice a decline in your VO2 max, it’s only natural to be ...

Your watch’s VO2 max isn’t perfect, but you can improve its accuracy with better data and heart-rate tracking.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Until recently, VO2 max testing has been inaccessible to most everyday athletes. Unless you had an in ...

Running to the best of your ability can feel like a numbers game. To hit new PBs, you’re probably under the impression that you should keep tabs on all kinds of ...