Define "cardiovascular endurance."

Cardiovascular endurance refers to the capacity of the heart, lungs, and muscles to work together efficiently during sustained physical activity. This endurance indicates how well these systems can supply oxygen to the working muscles and how effectively the body can utilize that oxygen during exercise. This capability is crucial for activities that require prolonged effort, such as running, cycling, or swimming, and contributes significantly to overall fitness and health.

In essence, higher cardiovascular endurance allows individuals to perform longer and more intense exercises without fatigue. It reflects the effectiveness of the cardiovascular and respiratory systems in managing energy expenditure while engaging in aerobic activities. Understanding this concept is vital for designing effective training programs focused on improving client fitness levels.