Which of the following is a health-related component of fitness?

• A. Agility
• B. Cardiovascular endurance
• C. Reaction time
• D. Speed

Answer: (B)

Cardiovascular endurance is a health-related fitness component because it measures how efficiently the heart, lungs, and circulatory system can deliver oxygen to the body during sustained activity, which directly affects overall health and disease risk. Regular aerobic exercise improves this endurance (think running, cycling, swimming) and boosts VO2 max, lowers resting heart rate, and helps prevent cardiovascular and metabolic conditions. The other options are skill-related components that influence how fast or agile someone can move in sports settings, rather than general health outcomes: agility is about quick directional changes, reaction time is about the speed of responding to a stimulus, and speed is about how fast you can move. So the health-related choice is cardiovascular endurance.