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Leg muscles are bundles of fibrous tissue that contract and relax to exert forces on bones and move the legs The main muscle groups in the legs are: quadriceps, hamstrings, adductors in the upper leg or thigh, and the calves in the lower legs.
The legs are the lower extremities that allow for standing, walking, running, and more. Their movement is produced by the contraction and relaxation of leg muscles and their connection to the skeleton through tendons. The movement of the legs produced by these muscles happens around the leg joints, particularly the hips, knees and ankles.