Which statement best describes a closed-chain movement?

• A. The distal end moves freely in space
• B. The distal end is not fixed to a surface
• C. Involves single-joint movement
• D. The distal end is fixed to a surface, and multiple joints and muscles are engaged (Correct)

Answer: (D)

Closed-chain movement involves the distal end of a limb being fixed to a surface, which requires multiple joints and muscle groups to work together to produce the movement. When the hand or foot is planted, motion happens through coordinated action across several joints, enhancing stability and functional transfer. This is why the statement describing the distal end as fixed to a surface and involving multiple joints and muscles best captures the concept. By contrast, movements where the distal end moves freely or is not fixed to a surface tend to involve a single joint or a simpler, less integrated pattern (for example, lifting a weight with the hand or foot moving through space). So, the essence of closed-chain actions is that a fixed distal point combined with multi-joint coordination defines these movements. Examples include push-ups and squats, where the hands or feet stay on a surface while the rest of the body moves.