As a kid, I know I ate Maypo hot cereal but I don't remember it very well. I think I may be confusing it with Malt-O-Meal. Whichever, one of them I liked very much.
Maypo was obviously appealing to the "bodybuilder" in us kids (me included). I now find out they even had a bodybuilding club! But it's amusing to see they thought lifting weights developed "useless muscles."