Stand up straight with your back to a wall.
Lean your back and buttocks against the wall and walk your feet apart to hips width.
You may also need to walk your feet forwards a little.
Slide down the wall until you are in a squat position with your hips and knees at 90 degrees.
Ensure your knees travel directly forwards over your toes.
With your back and buttocks still against the wall, hold this position while rising up onto the balls of your feet.
Lower your heels back down and then repeat.
