Lie down on your back.
Take a belt or a stretching strap and place it underneath the ball of your foot.
Next, take your opposite leg and cross it over the other leg at the knee.
Pull the strap towards you, as you apply pressure down on the ball of your foot.
You will feel a stretch down the back of the straight leg in the calf and the back of the thigh, and a stretch in the buttock of the bent leg.
Hold this position.