Which component relates to range of motion at a joint?

• A. Flexibility
• B. Body composition
• C. Muscular endurance
• D. Cardiovascular endurance

Answer: (A)

Range of motion at a joint is about how far a joint can move. The fitness component that explains this best is flexibility, defined as the ability of muscles, tendons, and other soft tissues to allow a joint to move through its full range. A joint’s ROM depends on tissue length, joint structure, and nervous system control, and it improves with regular stretching and mobility work. The other options describe different aspects of fitness—body composition relates to fat and lean mass, muscular endurance is how long muscles can sustain contractions, and cardiovascular endurance is the efficiency of the heart and lungs during sustained activity—so they don’t directly address how far a joint can move.