There are many people in the US for who "work" necessarily means physical work. From NPR (through the programs Planet Money and This American Life) on how so many Americans are on disability (http://apps.npr.org/unfit-for-work/):
Over and over again, I'd listen to someone's story of how back pain meant they could no longer work, or how a shoulder injury had put them out of a job. Then I would ask: What about a job where you don't have to lift things, or a job where you don't have to use your shoulder, or a job where you can sit down? They would look at me as if I were asking, "How come you didn't consider becoming an astronaut?"
Over and over again, I'd listen to someone's story of how back pain meant they could no longer work, or how a shoulder injury had put them out of a job. Then I would ask: What about a job where you don't have to lift things, or a job where you don't have to use your shoulder, or a job where you can sit down? They would look at me as if I were asking, "How come you didn't consider becoming an astronaut?"