To maintain this one o’clock posture¹ through to the end, it helps to picture your head resting on a pillow at the finish. 
 
　　Since the lie angle (the angle from the ground to the shaft² when the club is soled) of most clubs is built around 60 degrees -- about 65 degrees for the shortest clubs and 55 degrees for the longest -- you must bend forward about 30 degrees, or to one o’clock, to reach this optimum 90-degree angle.

　　When your address is too erect³ (12 o’clock posture) or bent⁴ over (two o’clock posture), it’s almost impossible to swing the club on this path. When vertical⁵, the tendency is to roll the arms early during the takeaway, promoting a very round swing path. The likely result is a pull and maybe even a topped shot. When hunched⁶ over, the tendency is to swing the club too much from the inside. This makes it difficult to clear the left side of the body out of the way during the downswing, leading to an open clubface, and, in most cases, a shot pushed to the right.

　　ESTABLISHING THE correct forward tilt⁷ at address is only one element of good posture. The other is making sure all your weight-bearing joints⁸ are lined up at address. The top of your spine⁹, insides of your elbows, fronts of your knee caps, and balls of your feet should be aligned¹⁰ vertically¹¹. This promotes good balance and posture during the swing.

　　At address, picture yourself standing¹² on a balance beam. To prevent yourself from falling off, you have to balance out these joints. Leaning too far back (on your heels) or too far forward (on your toes) will tip you off the beam. 

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