What does cardiovascular endurance refer to?

Cardiovascular endurance specifically relates to the ability of the heart and lungs to supply oxygen to the body during sustained physical activity. This capacity is crucial because it enables individuals to engage in aerobic exercises, such as running, cycling, and swimming, for extended periods without becoming excessively fatigued. When the cardiovascular system is efficient at transporting oxygen and nutrients to working muscles, it allows for enhanced performance during physical activities, improved stamina, and better overall fitness.

The other options pertain to different aspects of physical fitness. For example, the ability to perform strength training exercises relates to muscular strength and endurance rather than cardiovascular endurance. Sustaining physical activity without fatigue is a broader concept that can involve multiple fitness components, while muscle recovery efficiency deals with how well a person's muscles recover post-exercise, again focusing on different facets of fitness unrelated to cardiovascular endurance alone.