I’m starting to feel some strain in my hands, so I’m going to take Vivek Haldar’s advice:
Act like you do have RSI, and change your set up right now to avoid it.
For one thing, I bought an ergonomic keyboard this weekend. It lets me hold my hands in a more relaxed position.
When I learned to type, I learned to use the shift key on the opposite hand of a letter to capitalize it. For example, holding down the shift key with my right hand to type an A with my left hand. But for some reason, I never developed the analogous habit for the Control and Alt keys; I only use these keys with my left hand. So while I’m getting used to a new keyboard, I’m going to try to use Control and Alt on the opposite hand of the letter they modify.
I may also try remapping another key to be the Escape key. I use Emacs, so I use the Escape key frequently. Some people recommend remapping Caps Lock to be an Escape key. I currently have the Caps Lock key mapped to be a control key. I may go back to using the default left control key and use Caps Lock as the Escape key. Or maybe I’ll remap the context menu key between the Alt and Control keys on the right side since I never use it.