Ha! Experiences forearm and shoulder pain. Proceeds to mention casually he's into rock climbing. DisplayS photos of games where (jerky) mouse mileage is, to put is mildly, excessive.

Talking about elephants in the room here... I don't think it's the keyboard or mouse, dude! ;)

I've done rock climbing myself. Obviously, it's a huge burden on the ligaments of the upper body. It's also very fun (not in the least because it's a bit scary), but you will feel those wrists a shoulders a bit the next day. Small price to pay, until it because really painful.

I would recommend to the author to try and mix in in some other fun sports like kite-surfing or mountain biking etc. Or dancing (salsa I can recommend if you're open to the latin music). And limit mouse-mileage-heavy gaming a bit maybe? There's a lot of other options (try Return of the Obra Dinn).

Finally, I don't know if other have experienced this, but reflecting a bit on how you do programming can also help. Thinking more, resisting that urge to start typing away did a lot for me personally wrt my wrists and shoulders starting to loving me again. But that may be just me, of course.