[joshmarlow]

I'll add my own anecdote here. I'd been having arm/shoulder aches for several years due to typing/mousing and when I started indoor rock climbing, it basically entirely disappeared. I'm assuming stretching/strengthening other arm muscles is what addressed it.

[overcast]

I always tell people to do pushups. It's the simplest exercise to do just about anywhere with your height in floor space. I guarantee that will clear up 99% of your back issues, especially those from excess time spent in a computer chair. Every hour or so, get up, bang out 10-20 pushups. You'll be amazed.