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Full Muscles of the Leg and Foot Description. [Continued from above] . . . The anterior muscles, such as the quadriceps femoris, iliopsoas, and sartorius, work as a group to flex the thigh at the hip and extend the leg at the knee. Posterior muscles, such as the hamstrings and gluteus maximus, produce the opposite motion â extension of the thigh at the hip and flexion of the leg at the knee.
1 What Muscle Is Used to Do Sit-ups?  You flex your hips by bending your trunk forward and you extend your knees when you straighten your legs. Walking, running and lifting objects from the floor all require your to flex your hips and extend your knees. The iliopsoas, tensor fascia latae, pectineus and quadriceps all flex the hip, but the quadriceps is the only one to extend the knee. The iliacus and the psoas major are located in the pelvis and they merge to form the iliopsoas muscle, which is the main hip flexor.