Not related to touch typing but the same is true of the eyes, focusing at a fixed distance all day kills the muscles. I would guess that's often the issue with

Not related to touch typing but the same is true of the eyes, focusing at a fixed distance all day kills the muscles. I would guess that's often the issue with RSI as well, that the muscles don't get enough variation. I've practiced a lot of martial arts, yoga and rock climbing along the way and never had any problems despite spending A LOT of time with keyboards.