Lie on your back with one knee bent and your foot flat on the floor.
The leg you wish to exercise should be lying out straight in front of you.
Tighten your abdominal muscles.
Using the muscles at the front of your hip, bend your straight leg, bringing your knee in towards your chest.
Maintain a steady speed, ensuring that your knee does not drift out to one side.
Straighten your leg back down in a controlled motion until you return back to the starting position.
