The hamstring stretch is an exercise designed to improve flexibility in the muscles located at the back of the thigh. To perform this stretch, sit on the floor with one leg extended straight and the other leg bent, with the foot resting against the inner thigh of the extended leg. Reach toward the toes of the extended leg while keeping your back straight, feeling a gentle pull in the back of your thigh. Holding the stretch for 15 to 30 seconds can help alleviate tightness and reduce the risk of injury. It is important to breathe deeply and avoid bouncing during the stretch to ensure safety and effectiveness.