This one may be more for us. I know when I study in front of the computer or read for hours my neck and shoulders ache. Here are some moves that may help, three of them you can do right in your chair!
This is a study of the effect of therapeutic exercise on function in stroke patients. It is about just exercise, without meaningful activity, but they used OT as well as PT therapists. It shows a significant gain in function for the patients who received ther-ex.