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Evidence Review
Exercise (VO₂ Max & Zone 2)
Verdict
ProvenEvidence Tier
S
Strongest evidence
Human Studies
Yes — extensive
Typical Cost
$0-50/mo
Cardiorespiratory fitness is the single strongest predictor of all-cause mortality in observational data. Each 1-MET increase in fitness is associated with approximately 13% lower mortality risk. Zone 2 training builds the aerobic base; high-intensity work pushes VO₂ max upward. No supplement, drug, or biohack comes close to the magnitude of this association.
The full evidence review — including why the most-cited VO₂ max study doesn't actually measure VO₂ max — and what that means for how you train — is in Section 1 (The Things That Actually Work) of The Anti-Longevity Playbook.
Reviewed by Dr. Ramy Khalil, MD · Double Board-Certified Internal Medicine · Last updated March 2026
Is exercise the best longevity intervention?
By observational data, cardiorespiratory fitness is the strongest single predictor of all-cause mortality. Each 1-MET increase is linked to ~13% lower mortality. No supplement has comparable data.
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