I didn't say it was natural. Tennis is not natural at all. I said a cross-over finish is natural with high swing speeds and top spin, because of inertia. It is about physics, not natural tendencies. Actually, towards the target finish is natural for most people, until they get good enough. No athletic kid playing on his own will play tennis properly, unless he/she is a very keen observer. Tennis is one of the most difficult sports to learn. There may be exceptions like Santana, or Seguera who also picked it up himself as a ball-boy. Your early education made you into a pro in the wood era. Sounds good enough to me. Education has to be conservative and a little behind the times, otherwise it will constantly change with the latest fad and that is not good.