Seconding this, and also: look to diet simultaneously for the purpose of gaining strength. Your body, not your mind, makes the decision on whether your wrists get stronger, and simply ensuring that it gets more protein and fewer antinutrients can make all the difference.

I found that regular mice gave me a lot of wrist problems after years of playing FPS games with a "death grip." I use trackballs and trackpads now. I understand that other people have trouble with trackpads so YMMV.