[91b top] Mishnah: Sages: Any type of work done with produce by a worker [ie: whether only with hands, with feet, or even just with one’s shoulders] entitles the worker to eat from it.
you can look here Prac-T-cal Tidbits: The Torah helps set rules for us to not only follow, but to use as practical guidelines for our lives. We should always ensure to take proper care of our workers (and see to it that they are properly rested and well fed). People are not simply machines to use and abuse. The best bosses are the ones that lead by example.