To do a Supine Hamstring Stretch, lie on the floor with both knees bent and feet flat on the floor.
Lift one foot off of the floor and bring the knee toward your chest. Clasp your hands behind your thigh below your knee. If you have difficulty clasping your hands behind your leg, loop a towel around your thigh.
Straighten your leg and then pull it gently toward your head until you feel a stretch. Do not pull at your knee joint.
Hold for 30 to 60 seconds and then relax for 30 seconds.
Repeat with the other leg.
Repeat on both sides four times.