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Shoulder Muscles.
(Changed - 31/12/2008)
The "Deltoids" are a group of muscles that surround
the shoulder joints and it is this group of muscles that move the
arms independently of the shoulders.
During the back swing movement the shoulder muscles remain in
a taut condition thus helping to hold the upper body unit tightly
together as a very compact unit thus ensuring that there is absolutely
no independent movement of the arms.
However as soon as the shoulders begin
to rotate into the down swing movement, the inertia
effect will immediately cause the passive arms to lag behind
the rotational movement of the shoulders. Therefore just before
the shoulders return to the original address position, the group
of muscles around the left shoulder begin to pull the passive arms
into the contact area thus counteracting this lagging effect.
However this pulling action by the
shoulder muscles must be controlled so that the club head makes
contact with the ball at the precise moment the shoulders are parallel
to the target line, thus counteracting
the inertia effect upon the arms, but the shoulder muscles
must continue to pull the passive arms through
the contact area whilst the shoulder are parallel to the target
line thus forcing the right arm to adopt the fully straightened
position.

From this moving sequence you can see
that the shoulder muscles pull the passive arms into the contact
area thus counteracting the inertia
effect upon the arms, so that so that the club head makes contact
with the ball at the precise moment the shoulders return to the
"Parallel
to the Target Line" -- and as the hips continue to
aggressively rotate/pivot towards the target area, the
muscles of the left shoulder pull the passive arms through the
contact area thus forcing the right arm into the fully straightened
position.
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