In a squat, which muscles are listed as prime movers?

• A. Hamstrings
• B. Gluteus maximus and Quadriceps
• C. Gastrocnemius
• D. Rectus abdominis

Answer: (B)

Prime movers are the muscles that produce the main actions of the movement. In a squat, the primary work happens at the knee and hip as you rise from the bottom position. The quadriceps group on the front of the thigh drives knee extension, providing the force to straighten the knee and lift you up. The gluteus maximus powers hip extension, helping to pull you upright from the squat by driving the hips forward and up. Together, these two muscle groups are doing the main lifting work. The hamstrings assist with hip extension and knee control, but they aren’t the primary engines in a standard squat. The gastrocnemius contributes to ankle stability and balance, not the main hip and knee movements, and the rectus abdominis mainly stabilizes the torso rather than generating the squat movement. That’s why the combination of gluteus maximus and quadriceps is the best match for the prime movers in a squat.