What is flexibility?

• A. Range of motion possible in a joint or series of joints
• B. The ability to run a marathon
• C. The maximum force a muscle can produce
• D. The ability to perform many rapid movements

Answer: (A)

Flexibility is the range of motion possible in a joint or series of joints. It describes how far you can move a limb and how freely the surrounding muscles and connective tissues allow that movement. Good flexibility means you can move through your joints’ full available range with minimal stiffness or restriction, which can improve mobility and reduce injury risk. The other ideas describe different physical traits: running a marathon measures endurance, the maximum force a muscle can produce is strength, and the ability to perform many rapid movements relates to speed or power. So flexibility is specifically about how much you can move a joint, not how long you can run, how hard a muscle can push, or how quickly you can perform movements.