Is VO₂max Training good for longevity?

Yes — the evidence for this is strong. Cardiorespiratory fitness (VO2max) is one of the most extensively validated predictors of mortality in the scientific literature, supported by multiple large meta-analyses spanning tens of millions of observations and hundreds of cohort studies, including a scientific statement from the American Heart Association recommending it be tracked as a clinical vital sign. That's reflected in an evidence score of 90/100 for its role in longevity, drawn from 6 studies, with an estimated impact on longevity rated substantial (95/100).