> I also don't spank my teen-aged son, but he has had to do his fair share of push-ups while listening to me explain to him the error of his ways.

He doesn't have to. It's not an requirement of life that he does. He's just submissive towards you.

I don't see why should it be a requirement. If he does, then why are they still a requirement? If he doesn't, why is it a good thing for him to comply? Why is he afraid? why is he submissive?

I understand you are not going to accept reality here. I know you have rationalizations to justify causing fear and pain in your "parenting". I understand it seem reasonable to you and that's not going to change. I quit.