Usually someone saying "move your fat ____" is not saying that the child is really fat, but that the child is being lazy or slow. However, it is a rude way of speaking to anyone and certainly should not be used to a child (and no school "gives" a child viruses - and sitting at a desk a few hours a day doesn't "make" a child fat). And no, spanking or hitting or beating children in any way is wrong and likely to produce, rather than prevent, violent behavior. There are many people who think what they are doing is for the good of the kids, but who are abusive, so if the person is being violent, s/he is being violent, regardless of intent, and that is a bad thing. Those who deal with children should, of course, want what is best for them, but it is also incumbent upon those people to learn what really is good for a child. Parents who starve their children, or who withhold necessary medical treatment, or who beat their children are wrong even if they do these things in the belief that it is in their best interest. If a parent beats the child, s/he could kill or permanently harm that child, even if s/he is doing so to try to keep the child from harm.