Fitness★ Gold articleVO2 max: why the number on your watch is called a top longevity marker — and how to raise it
VO2 max shows how much oxygen your body can take in and use at peak effort. It used to be measured only in athletes in the lab; now every other smartwatch shows it. We explain what the number means, what’s normal for your age and how to increase VO2 max without going to extremes.

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