The left shoulder

[metallion]

Here's an attempt to express a few things related to the left shoulder. The only inteniton of this post is being totally torn apart, should I state this incorrectly:

The intention of this post is also to desribe what's going on without involving too much TGM terminology.

Here we go:

Amateurs often feel they need to make use of the power in their left arm. The muscles in the left arm must be good for something!

But: The application of left arm power will make the swing a magnitude more difficult since the other power sources will have to rely on a fulcrum living a life of its own.

So the muscles of the left shoulder and arm are only used to being streched out and not as a source of power. Regardless of what kind of shot you are performing. (Well: Unless for certain putting strokes)

The application of left arm - or left shoulder - muscle power is called over-acceleration. The result is the upper torso and shoulders getting too far ahead in the swing and more so: Getting off-plane.

What to do:
First of all make sure the left shoulder gets a nice pre-stretch as result of the Extensor Action at impact fix.

Also make sure the stretch will be there at impact. Do so by:

Swingers
As the right shoulder rotates down on plane the lagging club will indirectly and automatically stretch the left shoulder. The more extensor action that has been maintained during the backswing, the less of a variation in stretch will be perceived as the right shoulder starts rotating. And less variation means a better platform for precision.

Hitters
The Hitter will slightly open the right hip before takeaway, i.e. close the hips in relation to the target line. The opening of the hips will create more room for the backswing, but also slightly lessen the stretch in the left shoulder. So at startdown the Hitter will pre-stretch the left shoulder by sliding the hip towards the target.

Both these actions:
- Right shoulder down plane (Swingers)
- Hip slide (Hitters)
...has the effect of stretching the left shoulder to make it the stable, aligned quality fulcrum working on-plane. I.e. what a precision golfstroke requires.

Now tear that apart.