Probably most can do something with their hands, even if it doesn't involve lots of strength. The thing about the guy who wrote the book about switching from being some kind of knowledge worker to a motorcycle repairman has circulated here a few times, which is presumably less physically taxing than lumbering.
One thing to note: Crawford is a motorcycle repairman, but he's still a knowledge worker to some extent. And, of course, the book length treatment of the subject was subsidized by a university.
