Hip extension involves moving the thigh backward, such as when standing up from a seated position or walking uphill. The gluteus maximus is the most powerful contributor, producing the bulk of the force. The long head of the biceps femoris, along with semitendinosus and semimembranosus, also play a large role—they are part of the hamstring group and help extend the hip especially when the knee is straight. The posterior fibres of adductor magnus also assist by contributing force during the exten

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