I would do it if it was once in a while, but not all the time, especially if it's 7 days a week that means I have absolutely zero life. I work shift work and I'm so used to it now, I would have trouble going back to 5 days a week, nevermind 7. Currently I typically work 4 days at a time then get 4 off. My next set is 6 night shifts then I get 5 days off. It varies, but in general I get almost 50% of my days off.
Though if there was something routine that happens say, once a month, where they need someone to work crazy hours of physical labor, I would not mind doing it every now and then. Decent bonus and a good workout, and still get a break.
I did moving for a summer as a student, we moved all the stuff from my school to the new building. Was 10 hour shifts but we got Friday off, so that was a pretty good deal. 10 hours actually goes by pretty fast when you are doing light duty physical labor. I say light duty, because it was not go go go go, we got plenty of breaks in between, and it was not just moving stuff, but also cleaning and other misc tasks.