The single best fitness number for predicting how long — and how well — you live.
VO₂ max is how much oxygen your body can use at full effort — a direct read on your heart, lungs, blood, and mitochondria working together. We measure it properly, breath by breath, then build your training around your actual physiology.
the mortality-risk gap between the least and most fit in a 122,000-patient JAMA cohort. Fitness out-predicted smoking, diabetes, and heart disease.
per decade — roughly how fast VO₂ max declines after 30 if you don't train it. Trained, that curve flattens dramatically.
biomarkers we pair with your VO₂ max — because engine size and engine health are different questions.
VO₂ max is the ceiling on your aerobic engine — how much oxygen your heart can pump and your muscles can use. It falls with age, but far faster with deconditioning. Because it integrates heart, lungs, blood, and mitochondria in one number, it predicts longevity better than almost any lab value. And unlike your age, it's trainable at any starting point.
"Your smartwatch estimates VO₂ max from wrist data and pace. A true test measures the air you actually breathe. Train to the real number — not the guess."
A graded exercise test with a metabolic analyzer — mask on, breath by breath — gives your true VO₂ max and the thresholds that define your zones.
Zone 2 base work and targeted high-intensity intervals, prescribed from your measured thresholds — not generic heart-rate formulas.
We re-test every few months. The number moves, the zones update, and you watch your aerobic engine get younger.
We recommend testing to assess recovery, performance, or deficiencies — and pairing your VO₂ max with body composition and resting metabolic rate for the full picture. Add the metabolic and cardiovascular labs, and you know whether the engine is also running clean.
see the labs we runVO₂ max is part of the Metabolic Performance Program — paired with resting metabolism, body composition, and grip strength across two visits. Bundle them and re-test every three months to watch your progress move, with an expert results review that turns four numbers into one training plan.
Explore the program & pricingWatches infer VO₂ max from heart rate and pace, and they're frequently off by a meaningful margin. A metabolic test measures your gas exchange directly — it's the number exercise physiology is actually built on, and it gives us your training thresholds as a bonus.
No. The protocol scales to your current fitness, and the least trained people see the largest early gains. The whole point of a baseline is to start where you actually are.
With structured zone 2 volume plus one or two interval sessions a week, meaningful improvement typically shows in 8–12 weeks. We re-test rather than assume.
Because cardiorespiratory fitness is one of the strongest predictors of all-cause mortality we can measure. Longevity medicine that ignores VO₂ max is missing half the picture.