In the web I fund two exercises benefits for the computers works, or I think so.
Sorry, but the pictures don't view.
Take the hands straight out in front of you and rotate the arms so that the palms face away from each other. If this rotation hurts your shoulders, just press the palms together without the rotation. Cross the arms so that the palms are pressed together and round the back, reaching the arms away from you as you relax the head. Contract the abs and imagine that your stretching up and over an imaginary ball rather than collapsing in the middle. Hold the stretch for 30 seconds and repeat. http://exercise.about.com/b/2007/02/27/ ... tretch.htm
For the wrist, move the wrist up and sown with the ball cramped in the hand.