The golf swing as performed by Luke Donald illustrates in slow motion, the basic method of playing top quality golf.
As the back swing was performed the hips have pivoted so that the right hip is at its highest position whilst the left hip has dropped to its lowest position.
In addition, at the end of the back swing movement the whole body has been twisted to its maximum whilst the left heel has remained firmly on the ground.
The down swing is initiated by reversing the pivotal action of the hips so that the left hip is forced to rise to its highest position whilst the right hip drops to its lowest position.
This pivotal action of the hips forces the upper body to follow its movement.
Almost immediately the right elbow is forced into his waistline with the left arm remaining close to the right shoulder.
The action of pulling the right elbow into the waistline is the beginning of the Magic Move
Therefore as Magic Move is performed, the whole body is forced to adopt the impact position by the rotating /pivoting action of the hips so that the left hip is at it highest point a fraction of a second before the club head strikes the ball.
However once the right elbow is pulled into the waistline it remains in this position whilst the whole body rotates into the down swing.
You will note that the shape of the upper body does not change until the club head strikes the ball.