Lie on your back with your knees bent and your feet flat on the floor.
Keep your legs hips width apart and tighten the core stability muscles by lifting your pelvic floor and drawing your abdominal muscles into your spine.
Image you are trying to pull the two bones at the front of your pelvis together.
Holding this tension, drop one knee out to the side.
Do not allow the other knee to move, or your hips to rotate with the movement.
Control this position as you bring the knee back up to the starting position.
