VO₂max describes the maximum amount of oxygen your body can utilize during intense exercise. It is widely considered one of the best indicators of cardiovascular fitness and endurance capacity.
Many wearables estimate VO₂max automatically using heart rate, pace and training data.
The most important reference point is your personal development over time. Single measurements may fluctuate, while long-term trends provide better insight.
VO₂max becomes especially informative when analyzed together with HRV and resting heart rate.