VO₂ max measures the maximum amount of oxygen your body can use during intense exercise. It reflects your cardiovascular fitness and aerobic endurance. This number matters because it links directly to your overall health and how long you might live. Understanding VO₂ max helps you track fitness progress and make smarter health choices. Runner checking heart rate monitor during outdoor exercise What VO₂ Max Tells You About Your Health VO₂ max shows how efficiently your heart,