The coiling of both the body (stance) and the forearms is probably the best part of the book for me.
What it does is it braces your left side and provides a feeling of power (and physically gives you power by means of the coiling in the body and arms). It's a very cohesive feeling as your hips are coiled towards the target the same way as your forearms are.
I'm not looking to use this in my swing persé but it's an interesting feeling to be able to play around with. I'm really looking forward to Lag's or anyone else's thoughts on this:
Stance:

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Arms:Left arm:1. Take your normal setup.
2. While keeping your grip/hands in the exact same position, turn your arm counterclockwise until you feel nice tension. It may feel awkward or even impossible at first but it will become easier over time. (Try to turn the arm both sides so you can get a grasp on your range of motion.)
So essentially nothing moves or coils in your arm except for your elbow joint and forearm. (The biceps/triceps will turn a little bit as well as a result but no need to worry about that.)
Right arm:1. Take your normal setup. You should have your upper arm pinned close to your chest.
2. While keeping your grip/hands in the exact same position, turn your forearm counterclockwise. This arm won't really turn as much (because of the greater angle in the elbow and because the upperarm is glued to the chest), but what matters is that you feel the forearm muscles turning towards the target.
Abe's idea is to have this feeling at address, then during the takeaway try to keep this tension until the arms give in and roll back 'open' to the top of the backswing.
If done correctly, the downswing should feel like an automated reversal of the backswing..
If I keep my left armpit connected to my upper arm and my right elbow close to my right hip I find it sets up a nice little 'slot' in which you can swing freely.