Begin by sitting upright in chair. Maintain good posture, positioning self on sit bones (ischial tuberosities). Spine is in neutral position with a flat lower back. Interlock fingers and place hands behind head. Elbows are in front of ears.
While maintaining good upright posture, squeeze shoulder blades together as elbows swing outward. Pause and return to start position. Repeat for prescribed repetitions and sets.