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Shoulder Muscles.
Master - (Changed - 05/09/2008)
The "Deltoids" are a group of muscles that surround
the shoulder joints and it is this group of muscles that allow us
to 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 during the back swing.
However a fraction of a second before
the shoulders return to the original address position, the muscles
of the left shoulder pull the passive arms into the contact area
thus counteracting the inertia effect upon the arms -- and then
as soon as the shoulders return to the original address position
they must remain in this position, albeit for only a milli-second
whilst the muscles of the left shoulder pull the passive arms through
the contact area, thus forcing the right arm to adopt the fully
straightened position.

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