Gym Exercises Muscles involved MAIN MUSCLES: gluteus maximus, hamstrings (semimembranosus, semitendinosus and long head of the biceps femoris), (muscles of the lower back and along the spine) SECONDARY MUSCLES: gluteus medius (rear), great adductor, smallest adductor, piriformis ANTAGONISTS: iliopsoas, front quadriceps, tensor fasciae latae, pectineus, sartorius Execution Stand with your feet slightly apart and your legs almost straight, holding the barbell overhand (palms down)