Stand up straight on a step.
Place the step in front of a wall, or close to a rail for support.
Walk your feet backwards so that your heels hang off the back to the step.
Move your weight onto the leg to be exercised, lifting the foot of your other leg off the step.
Keeping your knee straight, rise up onto the ball of your foot.
Control the movement as you lower your heel back down and repeat the movement.
