Been there. One set of (otherwise paired) muscles gets inflamed. The two things that helped me were: (a) Microsoft Trackball Explorer which is a lovely ergono

Been there. One set of (otherwise paired) muscles gets inflamed. The two things that helped me were: (a) Microsoft Trackball Explorer which is a lovely ergonomically shaped mouse - providing you are right-handed. (b) Tennis ball (or similar) to squeeze which helps build up both sets of muscles and thereby helping "rebalance" your wrist muscles.