Attach the band to a door handle anchor, and place it at the middle behind a door.
Grasp the end of the band with both hands
Stand up straight, feet hip width apart. The side of your body is facing the door. Activate your core.
Twist your body against the resistance of the band while keeping your feet in the same position
Try to keep your upper and lower body stiff while you move from your hips and your mid back.
If you are able to do more than 10-15 reps, change to a heavier band.