During the upward (rising) phase of a barbell back squat, which muscle is the prime mover for hip extension?
Show answer & explanation
Answer: B
Iliopsoas: The iliopsoas is the main hip flexor. It works during the lowering phase only to control the movement, not to extend the hip.
Gluteus maximus: Correct. The gluteus maximus is the strongest hip extensor and is the prime mover as the hips extend to stand up from the squat.
Rectus femoris: The rectus femoris extends the knee and flexes the hip, so it works against hip extension rather than producing it.
Tibialis anterior: The tibialis anterior dorsiflexes the ankle. It does not cross the hip.
Hip extension: gluteus maximus is the prime mover, helped by the hamstrings. Hip flexion: iliopsoas.