Interesting. Can anyone explain why this works? My best guess is: by climbing, you exercise your muscles in that area, thus making them more resistent to damage from typing. But I don't really know anything about medicine.
Plus, exercise helps muscles heal and stay healed. They like moving around. Exercise helps keep the blood and lymph flowing through muscles, both directly (I believe that moving around keeps fluids sloshing about and causes blood to be directed to the moving muscles) and indirectly (exercise builds cardiovascular health, which leads to better circulation and oxygenation). It even improves your sleep, which has many excellent side effects.