Professional triathlete Kristian Blummenfelt registered a mind-bending score.

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

It’s hardly surprising for elite athletes to have higher VO2 max scores, but this takes it to an entirely new level.

By most measures, Norwegian triathlete Kristian Blummenfelt is the standard of peak performance in athletics. He won the gold ...

The V stands for volume, and the O2 stands for oxygen. VO2 max is a way to measure the maximum rate of oxygen your body absorbs and consumes during exercise. It might also be called your oxygen uptake ...

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Whoop has introduced VO2 max estimation, giving users access to one of the most important markers for assessing cardiovascular fitness and aerobic endurance. The feature is now available to Whoop 4.0 ...

VO2 max is an intimidating word for an easy-to-understand biometric: It’s how well your body uses oxygen when you push yourself. Short for “maximal oxygen uptake,” it’s been the gold standard for ...

Vanessa is a lead writer at CNET, reviewing and writing about the latest smartwatches and fitness trackers. She joined the brand first as an on-camera reporter for CNET's Spanish-language site, then ...

Many people enjoy running for the endorphins and sense of achievement rather than the statistics. For several runners, though, taking stock of their fitness metrics is part and parcel of the process, ...