Stand straight with your arms to the side or on your hips.
Take a large step forwards on your affected leg, then drop your hips directly down between both feet, bending your hips and knees to a 90 degrees.
Push back up to the starting position, and repeat.
Make sure you take a large enough step that your front knee does not travel over your foot, and ensure your knee travels directly forwards.
Keep your body up straight throughout the movement.
