Which of the following best describes flexibility?

Flexibility is best defined as the capability to move joints through their full range of motion. This refers to the extent to which muscles, tendons, and ligaments allow for the mobility of a joint. Greater flexibility can lead to improved performance in physical activities, decreased risk of injury, and enhanced overall fitness. It involves various components, including dynamic flexibility—how well one can move a joint through its range of motion during movement—and static flexibility, which is the ability to hold a position at the end of the range of motion.

The other options do not accurately describe flexibility. Lifting heavy weights relates more to strength, which is the ability to exert force. Performing compound movements involves using multiple muscle groups and joints, but does not specifically assess how far those joints can move. Lastly, endurance in aerobic activities focuses on the ability to sustain prolonged physical activity, rather than the range of motion of joints. Therefore, the correct answer emphasizes flexibility as a distinct fitness component related to joint movement.