Turning in your golf swing is really important on your backswing, you need to feel some sort of a wind. Now it is a little bit different when you are doing one-plane versus two-plane.
In a two-plane backswing what is happening is you are standing taller and your arms are working straighter back. Because you are so tall your shoulders are going to turn more level, they are going to turn more perpendicular to your spine. They are going to be turning more level to the ground, which gives you some roundness to your golf swing. So again, the club is working straighter back and you are making a very level shoulder turn when you are doing this so that you can hopefully get the club traveling down on that plane to impact.
In a one-plane swing when you swing the club across the body you effectively get turned. It is a little easier as you are not thinking about winding and twisting. You are more bent over, your arms are swinging across your body and it is almost the stretching motion of your arm going across your body that is effectively giving you this windup.
Difference Between One-Plane and Two-Plane Backswing
What you will notice in a one-plane golf swing is that the windup is a more centered look, I have a more centered looking turn. In a two-plane golf swing I have a little bit more sway in my golf swing, you can see where I have moved behind the ball, my shoulder might turn behind the ball, it might pull my front foot up on my toe, it will have a more weight shift look. I like the one-plane golf swing because I think it helps women.
Number one I am more bent over so there is less lateral motion, there is less sway, which is a big tendency of ours. It helps you stay a little bit more stable. So I think it is a good idea if you are going to play the one-plane swing just to get used to the fact that it is going to be a centered windup, you are merely stretching your arms across your body and it is effectively giving you the windup that you need.
Do not try to shift your weight, do not try to move behind the ball because then you will be doing a combination of a one and two-plane rather than having a pure move.