What does cardiovascular endurance refer to?

Cardiovascular endurance primarily refers to the capacity of the heart and lungs to supply oxygen during prolonged activity. This means that when you engage in activities that require sustained effort, such as running, swimming, or cycling, your heart must pump blood effectively, and your lungs must efficiently transfer oxygen to the bloodstream. Good cardiovascular endurance ensures that your muscles receive the oxygen they need to perform at optimal levels over a prolonged period, allowing you to maintain high levels of performance without fatigue.

Options that refer to muscle performance, recovery after exercise, or the strength of specific muscles do not capture the core idea of cardiovascular endurance. Instead, they highlight different aspects of fitness, such as muscular endurance, recovery abilities, or muscular strength, which are important but distinct from the concept of cardiovascular endurance.