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In closed kinetic chain exercises, the unique aspect of the position of the hand or foot is that it is fixed and does not move. This characteristic means that the distal segment (such as a foot or hand) is in contact with a stable surface, like the ground or a wall, resulting in increased stability and joint congruence. This stability allows for better force distribution throughout the body and promotes safer movement patterns.

Closed kinetic chain exercises engage multiple muscle groups and joints simultaneously, which is beneficial for improving functional strength and stability. When the hand or foot is fixed, movements primarily occur at the other joints involved in the chain, enhancing the coordination and strength of those muscles.

In contrast to this, if the hand or foot were free to move, in the air, or only lifted off the ground, it would indicate open kinetic chain exercises, where the distal part is not fixed, leading to different mechanical advantages and challenges.