When the hand and arm are horizontal with the ground like picture 1 and the club’s shaft is perpendicular with the arm, we could say that it has a normal
balance and rhythm. Actually, this can make a great impact by preventing a wrist from being loose when you down-swing. Additionally, Amateurs tend to have their right arm over-extended like in picture 2. This is very important thing to be observed.
Most of players whose right arm is over-extended are apt to be low in body balance when they down-swing and cannot make any strong and accurate impact due to the collapse of the right knee.
And do not forget that you should not grip so hard when the back-swing reaches here. By Lee, Choong Ho