Loss of swing width can be defined as a narrowing of the swing arc especially during the backswing. This is usually caused by an immediate bending of the back arm, trying to keep the back elbow in close to the back hip. This move inhibits the ability of the golfer to perform a one piece takeaway. The larger muscles must control the movement which allows the shoulders to be set on plane early in the backswing.
In order to create swing width from the outset of the backswing, several physical characteristics must be developed. First and foremost, the ability to separate the upper body from the lower body is essential to develop width. Secondly, the neck must possess adequate flexibility to allow the shoulders to rotate without changing the head position. Thirdly, spine mobility and lat flexibility is needed to create rotation of the upper body as the arms separate and move away from it during the backswing. Finally, the spine must possess good stability to maintain posture as the arms move away from the body.