Lie on the floor, a strap or band at your side. Raise one leg at as close to a 90-degree angle as possible and wrap the strap around the arch of your raised foot. Tighten (flex) your thigh so your leg is as straight as you can get it and pull your foot toward your head. Don’t force it; you just want to feel some tension. Relax your thigh, then tighten it again and pull your foot toward your head. Repeat tightening and relaxing for two minutes or until you reach four or five minutes. Switch sides.