A golfer must picture and must feel the golf swing as a unit—one completely connected effort, not a series of conscious details. Correct posture at address makes it possible to coordinate the hands and body so that they will supplement each other rhythmically during your swing rather than set up blocks against each other.
At address the golfer should be one interrelated package. The shaft, the left wrist, the left arm and shoulder are fused together, none of them stretched stiffly away from the body. With the right hand necessarily lower than the left on the shaft, it is essential that the body accommodate this fact: the hips must open slightly toward the target, with the shoulders parallel or slightly closed to the line of flight, the right shoulder riding slightly lower than the left. The right arm will be slightly bent, the upper part fairly close to the body. The knees, of course, must be flexed in order to enable you to place the clubhead behind the ball and square to the target.
This blended address makes for a swing in which the various parts will blend their movements. But beginners and poor golfers ruin their chance for a blended swing when they stretch the club, hands and arms far out of position at address. Then, during the swing, these various parts work as two or three disconnected and warring elements and not as a unit.
from JOE KNESPER Mayfield Country Club, South Euclid, Ohio