Stand 'on your toes' i.e. with the balls of your feet on the edge of a low platform or step about 2.5-7.5cm high.

Your feet should be about shoulder-width apart, and your arms extended at your sides.

Keeping your legs straight, slowly lower your heels until they are just below the level of the step, but not resting on the ground.

Pause for a count of one, then slowly raise yourself back up onto your toes, as high as you can.

- Keep the movement slow and controlled - no bouncing. The only part of your body that should move are your ankles.

- Don't arch your back.

- Keep your abdominal muscles contracted.