Hamstring Muscle
The hamstrings sit behind the thighs and are the muscle group responsible for flexing (bending) the knee and extending the hip. The hammies make up a large percentage of the total volume of the upper leg and add balance and proportion for the look you’re after. In addition, well developed, strong hamstrings prevent injury and act as stabilizers for many other gym movements. The squat mimics their function giving them maximum stimulation.