Hack Squat Muscles Involved. Step 1 you will start in a squatted position with your thighs almost parallel to the. The hack squat is a highly effective way to train the quadriceps, which is made up of four different muscles:
The muscles used in the hack squat are the: The barbell squat is (or at least it should be!) heavily involved in any strength training plan. As your hips are in a fixed position and follow a specified range of motion, the hack squat can emphasise the quads and the knees.