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The images below from the WGC-CA Championship at Doral on 3/15/2009 illustrate why it can be difficult to maintain clubface alignment from address to impact.
The black lines show the shoulder, arm and shaft angles at address.This is the same view of address with red lines showing where the hands, shoulders, leading arm, and shaft will be at impact.
The red lines in the next photo indicate how the shoulders, arms, hands, and club have changed position at impact. The leading shoulder has raised approximately 18 degrees. The hands have moved forward, and the angle between the leading arm and shaft has been reduced to a straight line to the ball.
In the photo on the left, black lines show the starting point at address. The change of angles and position of the shoulders, leading arm, leading hand, and club at impact are indicated in red.
The yellow lines show an angle of about 25 degrees between the leading forearm and the back of the left hand at address.
At impact, the single yellow line shows the flat position of the back of the leading hand and how the leading arm and shaft form a straight line angle to the ball. This position of the leading hand has been called "the position of champions."
In addition to the change in position and angles of the hands, wrists, and forearms, they are also rotating in counter-clockwise motion through impact. Clubface alignment to the target line can easily vary as the rotation occurs.
If the timing of rotation is late, the clubface will be more open than anticipated at impact causing the ball to start to the right of the target line. If the timing of rotation is early, the clubface will be more closed than anticipated at impact, causing the ball to start to the left of the target line.
The rotational motion of the leading hand, wrist, and forearm is supination, and can be more easily remembered with the phrase "holding a cup of soup". The motion of the trailing hand, wrist, and forearm is an opposite motion and is called pronation.
Golfers using traditional pre-shot alignment technique, as shown above, are required to properly time the change in position of the hands, wrists, and forearms as they supinate and pronate so that the clubface is aligned properly at impact. This can be difficult even for the most highly skilled players.
An alternative is dynamic pre-shot alignment, which can reduce the variation in position of the hands, wrists, and forearms between the address and impact positions. Dynamic pre-shot alignment can help synchronize pronation and supination of the hands, wrists, and forearms so that clubface alignment at address is a more reliable representation of clubface alignment as it will be at impact.
Dynamic pre-shot alignment can result in a significant increase in control of clubface alignment at impact by reducing the need to rely on a golfer's ability to properly time pronation and supination of the hands, wrists, and forearms at impact.
Dynamic pre-shot alignment is an integrated technique that also can stabilize alignment through impact for both putting and chipping.
To learn more, visit the Dyn-Align website at http://www.dynaligngolf.com/
