VO₂ max, or maximal oxygen uptake, is the maximum amount of oxygen your body can utilize during intense exercise. It reflects the efficiency of your heart, lungs, and muscles in delivering and using oxygen to produce energy. VO₂ max is considered the gold standard in fitness because it provides a comprehensive measure of aerobic capacity and cardiovascular fitness.

1. HEALTH INSIGHTS: A higher VO2 max is associated with lower risks of cardiovascular disease, improved metabolic health, and greater longevity.

2. TRAINABLE METRIC: VO2 max can improve with consistent training, providing a clear goal and measurable progress for fitness needs.