Sit on the floor or a bed with your leg stretched out in front of you.
Place a belt around the ball of your foot and hold an end in each hand.
Bring your foot up towards you a little.
With tension in the belt, press down through the ball of your foot into the belt.
Hold this position.
Relax the pressure in your foot but not the tension in the belt.
Pull the belt in towards you a little to stretch your calf.
Repeat in this new position.