Movement: Stand next to a padded platform set at roughly knee height. Place the lower leg of the leg to be stretched onto that platform, angling the lower leg away from the body. Now slowly rotate your torso around towards the opposite side as your elevated leg - moving through the hips while squeezing your butt and keeping your low back stable - until a good stretch is achieved. Hold for prescribed time.
Repetitions: Hold for the full prescribed time on one side, then switch sides and repeat. This counts as one set.