VO₂ Max — the maximum amount of oxygen the body can use during exercise — is recognized by the American Heart Association as one of the strongest indicators of cardiovascular health and longevity.

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

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It’s FDA-cleared, backed by real clinical data, and takes just 12 minutes a day. I tested it for more than two months.

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CU Anschutz sports cardiologist William Cornwell, MD, says there are meaningful benefits for every person knowing how much oxygen they absorb during exercise.

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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 ...