Longevity1 October 2026·12 min read
VO2 Max: The Single Best Predictor of How Long You'll Live
A 2018 JAMA study found that low cardiorespiratory fitness carries more mortality risk than smoking, diabetes, and heart disease combined. Here's what VO2 max actually is, why it matters more than any other biomarker, and the training that reliably moves the number.