I have never had a job that didn't require physicality, guess. The key is to be young and fit, which requires a lot of extra work, so make that programme fun, so you will do it. Wen you get older, expect things to get much harder. Bummer, really, but if ou haven't planned well, you are stuck, like I am.
But I have enjoyed doing geophysical exploration, working underground, and thirty odd years of mountain guiding and farming. I'll die happy, I hope. I have learned a lot of skills and made a lot of good friends.