Aerobic capacity measures the maximum amount of oxygen the body can utilize during intense exercise, reflecting cardiovascular and respiratory efficiency. It is often quantified through VO2 max testing. A higher aerobic capacity indicates a more efficient heart and lungs, enabling the body to sustain prolonged physical activity. This metric is crucial for endurance athletes, as it determines their ability to perform well during activities like running, cycling, or swimming, where oxygen delivery is vital. Improved aerobic capacity can lead to better overall health, increased stamina, and reduced risk of chronic diseases.