Final answer:
The prime movers for squatting motions are the gluteal group, especially the gluteus maximus, and the quadriceps femoris group which extends the knee. The gluteal muscles and the quadriceps work together to perform this complex action, engaging various synergists for movement support.
Step-by-step explanation:
The muscle group or complex that acts as the prime mover for squatting motions primarily comprises the gluteal group and the quadriceps femoris group. Specifically, the gluteus maximus muscle of the gluteal group is a significant prime mover in the squatting motion as it extends the femur at the hip joint. Additionally, the quadriceps femoris, located in the anterior compartment of the thigh, are crucial for extending the knee after the descent of the squat. The squat is a compound movement that also engages numerous synergists and stabilizers, such as the hamstrings and the erector spinae, to support the primary action.