VO2 Max is one of the most powerful and well-researched predictors of long-term health and lifespan. Higher cardiovascular fitness is consistently linked to lower risk of chronic disease and slower biological aging.
VO2 Max measures the maximum amount of oxygen your body can use during intense exercise. It reflects how efficiently your heart, lungs, and muscles work together to deliver and utilize oxygen.
A higher VO2 Max generally indicates better cardiovascular fitness and greater capacity for physical work. It is often expressed in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min).
Large studies have shown that cardiorespiratory fitness is a stronger predictor of mortality risk than many traditional risk factors. People with higher VO2 Max levels tend to have:
Even modest improvements in VO2 Max are associated with meaningful reductions in all-cause mortality.
The good news is that VO2 Max is highly trainable at almost any age. Effective strategies include:
Laboratory testing with a metabolic cart is the gold standard, but field tests and wearable estimates can provide useful tracking data. Common approaches include:
Because VO2 Max declines with age if left untrained, maintaining or improving it can help keep your biological age lower than your chronological age. It is one of the key inputs in our Longevity Score Calculator for this reason.