The phrase "hard labor" means doing physically or mentally demanding work that requires a lot of effort and may be difficult or exhausting. Full definition
Do NOT let anyone talk you into letting a cat continue in hard labor for more than two hours. (cfa.org)
I'm not suggesting hard labor in the kitchen, but I do think kids need to be responsible for clearing their dishes and helping with the cleanup. (parenthacks.com)
They all know how to play online games, but they're not willing to do hard labor. (nickyee.com)