How is cardiovascular endurance best defined?

Cardiovascular endurance is best defined as the capability of the heart, lungs, and blood vessels to supply oxygen to the muscles during prolonged physical activity. This definition emphasizes the importance of the cardiovascular system in supporting sustained exercise, which is crucial for overall fitness and health.

When engaging in activities such as running, swimming, or cycling, the efficiency with which the body can transport oxygen to the working muscles directly influences performance and endurance. A well-conditioned cardiovascular system enhances stamina, reduces fatigue, and improves overall exercise capacity.

In contrast, other options address different aspects of fitness that do not pertain to cardiovascular endurance. Some focus on muscular strength or body composition, which are unrelated to the efficiency of oxygen delivery and utilization during sustained physical activity. Thus, understanding this definition is central to personal fitness and the development of effective training programs aimed at improving cardiovascular endurance.