I am trying to exercise regularly in a gym, and I am finding that joint discomfort/pain is the limiting factor. When you're in your 20s or even your 30s, you don't generally think about that.

But enough IT types talk about RSI problems, wrists and such, that it ought to be on the radar screen if you are considering a physical job.

An uncle of mine had a physical job in a hospital most of his life and suffered from spinal stenosis, which I believe caused incredible pain in his retirement.

My mother was a computer programmer, but the whole reason she got a college degree was because she studied like mad in high school, because she was driven by escaping manual labor on the family farm. None of her siblings became farmers.