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Open kinetic chain exercises (OKC) or open chain exercises are exercises that are performed where the hand or foot is free to move. The opposite of OKC are closed kinetic chain exercises (CKC). Both are effective for strengthening and rehabilitation objectives.
For example, when you perform bicep curls, the kinetic chain of this exercise is about the muscles and nerves of your arm and shoulder working together to achieve elbow flexion, and not just about your biceps muscle, which is often your primary focus with this exercise.