Learn more about this metric and the best training sessions to add to your schedule to boost your cardio fitness.

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 ...

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 stats, like distance covered, pace per ...

Alex Hutchinson is a National Magazine Award-winning journalist and Outside’s Sweat Science columnist, covering the latest research on endurance and outdoor sports. New perk: Easily find new routes ...

Keeping track of VO2 max on your Garmin is a great way to monitor your aerobic fitness and cardiorespiratory efficiency, and viewing this figure is possible both on the watch and in Garmin Connect. We ...

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While the majority of us with a fitness tracker are acutely aware of such biomarkers as VO2 max and resting heart rate, we're likely not sitting at 90 for the former, and 30 for the latter – not to ...