Which of the following is NOT listed as a component of fitness?

• A. Cardiorespiratory endurance
• B. Muscular endurance
• C. Flexibility
• D. Hydration

Answer: (D)

Components of fitness describe the abilities that show how fit someone is. Cardiorespiratory endurance measures how efficiently the heart and lungs supply oxygen during sustained activity. Muscular endurance looks at how long muscles can keep performing repeated contractions. Flexibility assesses the range of motion around the joints. Hydration, while essential for performance and safety during exercise, isn’t categorized as a fitness component itself. It’s about fluid balance and helps support performance, recovery, and health, but it isn’t one of the measured components that define fitness. That’s why hydration is the option that isn’t listed as a component.