VO2 Max Explained: The Single Best Predictor of Longevity

Google this topic and you will get a hundred answers, half of them wrong. Here is the version that holds up. VO2 max measures how much oxygen your body uses at maximum exertion. It predicts longevity better than smoking status.

What it measures

ml of O2 per kg of bodyweight per minute. Higher = better aerobic capacity.

Normal ranges

Untrained adult male: 35–45. Elite endurance athlete: 75+. Each 3.5 ml/kg/min increase ≈ 10–15% lower all-cause mortality.

How to raise it

Zone 2 (60–70% max HR) base + weekly Zone 4–5 intervals. 80/20 split is the gold standard.

Pro tips

• Apple Watch / Garmin estimates are within ~10% of lab values for most users.
• Sprint intervals raise VO2 max fastest — 4×4 minutes at near-max with 3-min recoveries.

Frequently asked questions

Can VO2 max be improved at any age? Yes — even 70-year-olds gain 10–25% with structured training over 6 months.

Is high VO2 max enough? Pair with strength training; aerobic fitness alone misses muscle mass.

If you only remember one thing from this post, make it that the inputs matter more than the calculator.