Medically reviewed by Oluseun Olufade, MD VO2 max is a measure of the maximum amount of oxygen your body can utilize during intense exercise. It's an essential component of peak aerobic fitness and ...

This detailed guide with screenshots covers how to use VO2 Max with Apple Watch, why it's important, and how to view your data.

What Causes VO2 Max The initial understanding of VO2 max was that it was a measure of cardiovascular function, limited primarily by how rapidly your heart could pump oxygen-rich blood to your muscles.