We used Mashav Relocation for our local moving recently. It was only a loading/unloading job per hour. They did not have to anything especial since the furniture and other stuff were already packed. We offered them coffee and cupcakes in the morning and then another break at lunch time.
My husband bought them the same meals we were having from a nearby restaurant. But the head of the crew was rude enough to tell my husband that he had to pay for the time they were in break and my husband could not say no, who could? At the end they charged us about one hour extra for the break they took.
If you decide to use this company for your moving, do not worry about how tired they look or do not feel guilty if a delicious aroma has filled the house and they are hungry. They do not deserve to be treated nicely.