I've never had RSI severe enough to have to stop working because of it, but the minor issues I once had were completely cured by taking up indoor rock climbing.
Of course I don't know exactly why it worked, but my guess is that a) it massively increases blood flow into your forearms and hands, and b) it strengthens all the small muscles and tendons in your forearms and hands so much that typing and other movements don't even register as "strain" anymore.
If you start climbing, start slow and easy and build very slowly, especially if you are an athletic person who is used to improving fast and pushing yourself. The tendons in your fingers get stronger much more slowly than you expect.
Of course I don't know exactly why it worked, but my guess is that a) it massively increases blood flow into your forearms and hands, and b) it strengthens all the small muscles and tendons in your forearms and hands so much that typing and other movements don't even register as "strain" anymore.
If you start climbing, start slow and easy and build very slowly, especially if you are an athletic person who is used to improving fast and pushing yourself. The tendons in your fingers get stronger much more slowly than you expect.