In physical education, what does "cardiovascular endurance" refer to?

Cardiovascular endurance is defined as the ability of the heart, lungs, and vascular system to efficiently supply oxygen to the muscles during sustained physical activity. This capacity is crucial for overall fitness, as it enables individuals to engage in prolonged exercise without excessive fatigue. A strong cardiovascular system improves stamina, allowing for better performance in activities like running, cycling, and swimming. This aspect of fitness plays a vital role in both athletic performance and overall health, contributing to lower risks of chronic diseases and enhanced recovery during physical exertion.

The other choices focus on different aspects of physical fitness. Muscle strength pertains specifically to the power generated by muscles rather than the cardiovascular system's role in endurance. Flexibility relates to the range of motion of joints and does not directly connect to aerobic capacity. Lastly, balance involves the body's ability to maintain stability and does not encompass the cardiovascular aspect of fitness, making those options less relevant in defining cardiovascular endurance.