The American Academy of Orthopaedic Surgeons offers these suggested exercises:

• Tie an elastic tube to a doorknob. Then gently pull the tubing toward you, hold for five seconds, and repeat five times. Switch arms and repeat. Do this twice each day.
• Stand in front of a wall, resting your hands on it. Make sure feet are separated to shoulder-width. Do a push-up while leaning against the wall, holding for five seconds. Do this five times, twice each day.
• Sit in an armchair with your feet on the floor. Place your hands on the armrest, and push your body slowly up off of the chair, holding for five seconds. Do this five times, twice each day.

-- Diana Kohnle