I have to clear this up once and for all. I am very frustrated in understanding the overhead shot's back swing. I am asking about how much my racket should cross around my head. Usually right now it seems like I'm moving my racket straight back and then swing forward, then when I turn it automatically crosses just a bit. But then when I compare this to the pros, I see that their back swing crosses to the other side of their head far more than I do. Then! When I try to reach over to the otherside of hit forward, I find it hard to do the supination to pronate. Its a little hard to understand I know. If you don't understand please allow me to explain more, I am extremely frustrated with this question and performing the correct technique.