Good wrist action is no wrist action, meaning there's no cocking of the wrists. You don't need to cock your wrists in golf. Instead, you need to hold your wrists firm and rotate your arms. The PPGS uses a very limited, controlled amount of rotation, and it's the movement of the arms from the ball and socket joint in the shoulders that controls it.
Your arms can only swing in front of your body, so always remember where your aiming line is located and be sure that your toe line is parallel to it. Your palms need to always be perpendicular to the ground. So, if you take the club back toe up into the catcher's mitt, your thumbs should match that same position. This allows for a very controlled amount of rotation.
It's all about learning how to swing toe up to toe up. Work on the position of your thumbs and think about where the catcher's mitt would be on both sides of your swing. Try to synchronize your thumbs with the toe of the clubhead and eventually it will start to become second nature to you.
Keep it vertical!
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