STARTING POSITION:
Stand straight with your feet shoulder width apart. Place a chair in front of you and a little step between the chair and you. Step up on the step, place the toe of your right foot on the end of the step and extend your knee.
MOVEMENT:
Slowly let the right heel move downwards until you feel the stretch in your calf. Maintain the stretch during the required time, return to the starting position and then switch sides and repeat with the other leg.
TIPS: You should feel the stretch of the muscles but not pain.