Set up: Seated on a medium height, hard-backed chair.
Sitting upright but relaxed with your tailbone up against the back of the chair, place your hands behind your head. Arch slowly back over the chair, breathe in through sides and open up through your chest by keeping elbows wide. Only go as far as your body allows, do no push into pain. Hold for 20-30 seconds and return to seated position, repeat if desired.