Put a mini band just above knees and lie on your side with knees bent and stacked on top of one another.
Keep your head rested and keep one hand on your outer hip
Lift top knee up from the bottom knee, pulling the band apart while keeping ankles together.
Make sure that you do not rotate your hips while doing the movement.
Hold the top position for a few seconds.
Return to the starting position in a controlled way and repeat the movement.