This Test Might Be the Best Way to Track Fitness and Longevity
Briefly

For everyday people who want to be healthy and live a long time, the measurement is the best piece of empirical information we have on health and longevity. The key, she said, is acting on what the data tells you.
VO2 max is a two-digit number that expresses how effectively your body metabolizes oxygen. The more you can efficiently consume, the more energy your muscles will have, increasing the time and intensity you can exercise.
Read at www.nytimes.com
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