As someone who had mild to somewhat less than mild pain in wrists and finger joints I can give anecdotal evidence that training works. Power balls (heavy ones)

As someone who had mild to somewhat less than mild pain in wrists and finger joints I can give anecdotal evidence that training works. Power balls (heavy ones) and Captains of Crunch (still can't manage no. 2) took away years of pain. In retrospect it's obvious but perhaps one doesn't think of any bodypart as one needing regular exercise. Have pain? Exercise!