I used to get terrible RSI in my right-hand and right-forearm. At the time I was using a MBP at home and a desktop with keyboard + mouse at work. I eventually

I used to get terrible RSI in my right-hand and right-forearm. At the time I was using a MBP at home and a desktop with keyboard + mouse at work. I eventually narrowed down my RSI to mouse-wheel and track-pad use. Since switching from MBP to ThinkPads with TrackPoints I've had zero issues. The TrackPoint contains two strain gauges, so you're not really doing a "dynamic" movement while scrolling around, rather you're just altering the applied force. Just pretending to scroll a mouse wheel by doing the movement with my hand still hurts!