What does the term "cardiovascular endurance" refer to?

Cardiovascular endurance specifically refers to the capability of the heart, lungs, and blood vessels to supply oxygen-rich blood to the muscles during prolonged physical activity. This aspect of fitness is crucial for activities that require sustained effort, such as running, swimming, or cycling, as it determines how efficiently the body can perform over time.

When engaging in aerobic exercises, a well-conditioned cardiovascular system enhances the endurance level, allowing an individual to maintain physical activity for extended periods without fatigue. By improving cardiovascular endurance through regular aerobic exercise, individuals can also lower their risk of chronic diseases, improve their overall health, and enhance their performance in various physical activities.

The other answer choices relate to different components of physical fitness: muscle strength, flexibility, and body composition, but they do not specifically capture the essence of what cardiovascular endurance entails.