Lie on your back with your knees bent and your feet flat on the floor.
Your knees should be hips width apart.
Initiate your core stability muscles by drawing your belly button in to your spine.
Gradually drop one knee out to the side.
Whilst doing this movement, make sure your pelvis does not twist to follow the movement of your knee,
Control the movement as you bring your knee back up to the start position.
The key is to keep your trunk and pelvis still and not to arch your lower back.
