The One Number That Predicts Your Lifespan

In 2018, a study published in JAMA Network Open analyzed 122,007 patients over 23 years. The finding was striking: cardiorespiratory fitness (measured by VO2 max) was the single strongest predictor of survival — stronger than smoking status, diabetes, or coronary artery disease.

People in the top fitness quintile had a 5x lower mortality risk compared to the bottom quintile. Even more remarkable: there was no upper limit of benefit. Unlike blood pressure or cholesterol, where too high is harmful, higher VO2 max was always better.

What Is VO2 Max?

VO2 max measures the maximum amount of oxygen your body can utilize during intense exercise. It reflects the integrated function of your heart, lungs, blood vessels, and mitochondria — essentially, how efficiently your entire cardiovascular and metabolic system works.

What Is a Good VO2 Max?

For a 40-year-old male, average VO2 max is around 35-40 mL/kg/min. Elite status begins above 50. Peter Attia's framework targets being in the top 2% for your age — which typically means training to achieve a VO2 max 10-15 points above average.

How We Test It

At GenoRyx, we perform clinical-grade cardiopulmonary exercise testing (CPET) on a medical treadmill with real-time gas analysis. The test measures your VO2 max, lactate threshold, metabolic rate, and heart rate recovery — giving us a complete picture of your cardiovascular fitness age.

Your VO2 max is trainable. With the right protocol, improvements of 15-20% within 12 weeks are common. Book a VO2 max test with our team to establish your baseline and get a physician-designed training protocol.