I read this book a few months ago called "Whole Brain Power" by Michael Lavery. The author had some interesting theories and suggestions on better utilizing the whole brain, i.e., lateralization of the brain. Among other things, he points out that the homunculus shows the hands have the greatest amount of receptors in the brain. He suggested using your non-dominant hand to practice handwriting and practice hammer exercises. Basically get a rubber mallet and a golf ball and start bouncing the ball. Eventually get two hammers and bounce the ball back and forth. Once you get really good get a hammer and a smaller ball. I've found doing these exercises is very calming. I bounce the ball 50 times in each hand and then do alternating back and forth for 5 mins. At first, it was frustrating to bounce the ball using my non-dominant hand, but I got good at it quickly. The author states he can easily bounce the ball 500 times at a time. It is an inexpensive and easy thing to try. Best case scenario it actually improves your brain, worst its just a cheap stress reliever. I didn't have the patience to practice handwriting with my non-dominant hand. I think a rubber mallet was like $6 at Lowe's.
Anyways, interested in hearing others thoughts on these exercises.