Which of the following is a component of fitness?

• A. Cardiorespiratory endurance
• B. Hydration
• C. Meal planning
• D. Calorie tracking

Answer: (A)

Cardiorespiratory endurance is a fundamental component of fitness because it measures how well the heart, lungs, and circulatory system can supply oxygen to working muscles during sustained activity. This capacity underlies how long you can perform aerobic exercise and how efficiently you recover afterward. It’s typically tested with activities like a timed run or a cardio endurance test and improved through regular aerobic training, such as running, cycling, or swimming.

Hydration, meal planning, and calorie tracking are important for health and performance, but they’re not fitness components themselves. They’re factors and habits that influence how well you perform and feel, rather than describing a basic aspect of physical fitness.