As I define textbook, the one person I can think of who embodied this for me is Joe Louis. Everything he did was very tempered and precise, incredible economy of motion. He wasn't without flaws, we all know that. But I just think the thing that makes him "textbook" is that there is no slack in his movement, every motion was well used...he got the most while using the least. Give me some of your favorites. I really enjoy watching athletes who accomplish a lot by using their head/discipline.