Lie on your back with your legs bent and your feet on the floor and your knees at hips-width apart.
Straighten one leg out on the mat.
Initiate the core stability muscles, then gradually drop your bent knee out to the side.
The aim of this exercise is to keep the pelvis level, and the stationary leg still.
Imagine headlights on each hip bone pointing directly up to the ceiling.
Do not allow these headlights to rotate from this point.
Control the movement as you bring the knee back in.