I've seen too many to list, therefore I'll just ask you to make a list of shounen animes and hopefully out of the ones you name, I'll find one I haven't seen yet.
There's really no requirement. Just 2 simple ones.
1) No romance. Absolutely none. Not even infatuation.
2) Obviously, it has to have that typical "I want to get stronger" theme. It can be in anything, as in sports, academics, sword play, ANYTHING. As long as the protagonist thinks "I want to be stronger" constantly.