This is a qigong rehab exercise that I usually teach to clients with wrist or elbow problems. It is best done standing with feet about shoulder width apart and the knees bent, but it can also be done sitting. Relax the shoulders and draw your hands towards the chest with your palms facing you while breathing in and drawing the shoulder blades together gently. Then breathe out, let go of the shoulder blades, and extend the arms with the palms facing forwards and without forcing the movement, imagine pushing something heavy a long way away. Repeat as many times as you have time to do, 30 is a good number.