Posture and your set-up angles are what controls the centerness of your strike. If you’re hitting the ball with the toe or your heel, thick or thin, it’s probably because you’re losing your set-up angles throughout the swing. Now the reason most people lose their set-up angles throughout the swing is because they set themselves up in a posture that they couldn’t possibly maintain. Let’s have a look at posture from side on down the line. Here’s a very typical posture of the body where the golfer bends more from the waist and the shoulders than they do from the top of the legs and the hips. They end up with a very rounded back, so as they set-up to the ball, they’re stretching their arms out with a rounded back. I could get my body back to about here before something has to give. What normally gives from here is the body straightens up as it tries to restore itself into a good posture position. Now as that happens, I’ve moved way off my center, huge compensations have to take place on the way down. Every now and then I’m going to hit it in the middle of the club and of course, every now and then I’m not going to hit it in the middle of the club. Here’s an exercise to get the correct posture position from the profile: Stand with your hands behind your back and extend your hands down your back. And what this does is it pulls your shoulders back and down and puts you into a good posture position. From there bend forward at the top of the legs, maintaining the shape of your back, and then just unlock your knees. From here with your weight balanced evenly over the balls of your toes, you’ve got a nice straight back, you’ve got a set-up angle of your back that you can turn around and then re-turn around on the way down. That’s going to help that clubhead get back to impact and make more solid shots come right out the middle of the club.