The groundwork of golf analysis was established in a descriptive investigation presented by Rehling in 195520. He presented feedback from 13 right-handed elite golfers describing body position, movement and weight shift during the swing. Elite golfers reported that the ball was played off the left heel (front foot) with the hips and shoulders parallel to the flag and the club held in an overlapping grip. Back swing was executed by rotating the hips in a clockwise direction while simultaneously moving the hands, arms, and shoulders. Throughout back swing the chin remained in the same position as address while weight was shifted onto the back foot. The downswing began with initiation from the left hand and weight shift toward the front foot. Through the hitting area, the left arm and clubhead formed a straight line to the ball, with the right arm straight and the shoulders parallel to the line of flight. Beyond impact, weight remains on the front foot while the golfer rotates to face the line of flight20. A more detailed description of this general series of motions has become the focus of numerous investigators driven by longer drives and lower handicaps.