Attached the band to a door anchor and place the door anchor under a door.
Grasp the other side of the band with both hands.
Come into a half-kneeling position. Keep your core engaged and bend slightly backwards.
Twist your body from side to side against the resistance of the band.
Try to move from your mid back and keep your core engaged the entire time.
If you are able to do more than 10-15 reps, change to a heavier band.