With your resistance band still attached to the door, turn around 180 degrees and hold the end of your band in the hand of the shoulder you are exercising. You should still be perpendicular to the door. You may need to step away from the door a step or two to keep tension on the band.
Keep your elbow bent 90 degrees and tucked into the side of your body. This time, though, your hand starts near the doorknob. Then, slowly pull your hand in toward your navel. Be sure to keep good posture and keep your elbow bent and tucked into the side of your body. Hold your hand into your navel for two seconds, and then slowly return to the start position. Repeat this motion slowly for ten to fifteen repetitions. Then move on to the next exercise.