I’ve done both kinds of work on my own home. Calling it back breaking is pure hyperbole. Is it physical, certainly. But it’s something you can easily do until you’re 50 without issue and between 40 to 50, you can start taking apprentices that do the taxes that benefit from youth. Of the plumbers and carpenters I’ve hired, they are all in no worse shape than other adults their age.
I sit at a computer all day and it’s not good for my body either as I’m more sedentary than is healthy. I would say that my work is equally unhealthy but in different ways.