You reach a point during the back swing movement
when the rotational movement of the compact upper body unit will
not rotate any further without the head moving away from the Fixed Frontal position.
Just before the upper body unit
reach the absolute end of the back swing movement, press firmly
down on the ground with the left foot, and simultaneously force
the hips to rotate towards the target area
This dual action of pressing the left foot to the ground and forcing
the hips to rotate towards the target area will force the upper body unit to also begin to rotate around the central
core of the spine.
(Do not allow the hips to sway towards the target area as they
pivot.)
Therefore from the moment the down swing movement begins, the
hip and the upper body begin to rotate into the down swing movement at exactly the same time.
The upper body unit must remain
in this configuration (i,e. where the golf club is held at
approximately 90 degrees to the right arm.) whilst the whole body rotate around the central core of the spine.
However you have to judge to precise moment when to begin pull the arms into the contact area and whilst the whole body continue to rotate
around the central core of the spine,
This arm action must be timed so that the club head strikes the ball at the precise moment you begin to force the whole body to quickly turn to fully face the target area which happens at the same speed the club head moves through the contact area, whilst simultaneously you force the right arm to fully
straighten, again at the same speed that
the club head swings through the contact area, whilst
the head remains firmly fixed in the original address position.
Importantly, as the club head swings through the contact area, the right shoulder must be moving under the chin.
However you must
keep the elbows as close together as the arms interact.
(Top class golfers physically
force the right arm into the fully straightened position but for
now simply allow this happen automatically.)
But all this must be performed without allowing
the hips or the head to sway away from the original address position.