What the laws of physics want us to do
To develop a deep understanding of the golf swing, we have to understand some basic concepts from the laws of physics.
Linear motion vs. circular motion
In nature there are two sort of motion:
- Linear motion
- Circular motion
The golf swing is a circular motion.
A circular motion always spans a plane. The golf swing plane is defined by three points:
- The ball
- The target
- The swing circle center, which is the base of the neck
And the plane defines the main axis. Like in any circular motion the main axis is perpendicular to the plane and goes through the swing circle center.
Double pendulum dynamics
Now, where we know the main axis, we have to ask what is moving around that axis and how. The answer is simple: It is the double pendulum system incorporating the arm-shoulder-system (upper lever) and the club (lower lever).
Moving that double pendulum we have to take care about two things:
- The club has to move on plane
- The clubface orientation has to be square to the plane at impact
The first requirement is very easy to meet.
The second one is a little tricky.
Geometrically square means 90° between clubface and plane. The hands are not able to support that. So what we need in the back swing is an orientation we call golf square. A golf square clubface at the top gives you the best advantage for a reliable comeback to a geometrically square position at impact.
In the golf literature this point is being discussed as a flat wrist position.