Swing Center
Generally, the clubhead travels in a circle, in the middle of the circle is the swing center. The more the swing center moves during the swing, the more difficult it becomes to make consistent contact with the golf ball and the sweet spot. A swing with no weight shift and a swing center that does not move (like a short putt) is the easiest swing with which to make good contact, but it also generates very little power. Our goal in the full swing should be to create power and speed through rotation around the spine, and avoid lateral shifts left-to-right, which sap distance and consistency.Coach Evan on Swing Center
More on Swing Center:
jordan spieth: Slo-mo swing analysis (Staying centered)