Final answer:
The quadriceps femoris group is the prime mover muscle group for squatting motions, mainly responsible for knee extension during the exercise.
Step-by-step explanation:
Prime Mover for Squatting Motions
The prime mover muscle group for squatting motions is the quadriceps femoris group. This muscle group is located in the anterior compartment of the thigh and is responsible for moving the lower leg out in front of the body, as when kicking, and assists in raising the knee. During the squat exercise, the quadriceps extend the knee as you rise from the squat position. In addition to the quadriceps, the gluteal group, including the gluteus maximus, plays a significant role in squatting as it produces extension of the hip joint, allowing for the upward movement of the body. However, when specifically referring to the prime mover for knee extension during a squat, the quadriceps are the primary muscles involved.