Areas: Knees, Hips
Muscles: Quadriceps, Hamstrings, Iliopsoas
Lie on your back with legs straight. Place a towel under the heel.
Slide heel of the involved side up to the buttocks or as close as tolerable. Return to the starting position.
If possible, perform on a slick surface so the towel can slide easily. Should be a slow and controlled movement back and forth.