Swaying is when the heat moves laterally in the weight ships to the outside of the trail foot. This is a flawed pivot. Lateral motion is when the upper body moves back on the backswing but can be achieved without swaying. This is of benefit when loading up the driver swing and also for taking away the stress required in the backswing for older and less flexible golfers. Moving laterally behind the ball a little bit on the backswing with the driver makes it much easier to hit with an ascending angle of attack which reduces backspin and optimizes distance with the driver.