(I wrote about this, and Markison a few days ago here: http://lloydkahn-ongoing.blogspot.com/2015/01/hands-off-macspeech-dictate.html
The main thing he convinced me to do is to drink more water. He say 4 quarts a day, I'm starting with two (a half gallon). I'm going to fill a half-gallon container each morning and make sure it's gone by the end of the day.
He says that the body will divert water, especially if you eat grains and bread, to keep things moving through your digestive mechanism, and this leaves less blood to go to the hands. He does a "paleo diet" himself (meat, fish, chicken, vegetables, fruit) and cooks in parchment to retain moisture. He thinks a lot of physical problems come from dehydration.
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I'm getting back into using it regularly.
Let's face it: prolonged computer usage causes physical problems.