All nature has symmetry. Dr. Wright's balance reserch shows that body symmetry is created by three factors: Stance Width, Grip Size and Posture. Posture, as stance width and grip size is a highly individual position in your set up to the ball. Some people set up with very little spine tilt and knee flex and some set up with a good bit. Your posture is determined by one angle of your body. Dr. Wright demonstrates how to find your posture once you have your balanced stance widths.
In the next video, Dr. Wright and US Open Champion Sandra Palmer show the differences in their angles.
Dr. Wright's research determined that this posture angle shows up in over 15 address positions as illustrated in the following video.