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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.
Leg Extensions. The leg extension exercise works out just one major muscle group, your quadriceps, or quads.. Your quads run along the front of your thigh from your knee to your pelvis and are responsible for hip flexion and knee extension.