The term "cardiovascular endurance" refers to the body's ability to sustain aerobic activity over an extended period. It reflects how efficiently the heart, lungs, and muscles use oxygen during exercise. High cardiovascular endurance allows individuals to engage in activities like running, cycling, or swimming for longer durations without fatigue. Improving cardiovascular endurance often involves regular aerobic training, which enhances heart function, improves circulation, and increases overall stamina. This aspect of fitness is essential for overall health and is associated with a lower risk of heart-related diseases and increased longevity.