[airair]

It occurs to me that Basic Motion includes the study of the Primary Lever and the mechanics of Hinging. So, the Left Arm moves independent of the stationary Pivot. If the Left Arm is glued to the torso, then Hinge Action isn't available.

Maybe I can borrow something from the hacker interview to shed light on this question:

Q: Is there a best way to apply these principles?

A: You bet. Start with the short shots, the little chips and pitches. Thousands of them. Here is where you learn the basics of grip, stance, posture, the stationary head, the straight left arm and the bending right arm, the right forearm position and right triceps extension, tracing the line, the impact hands location and clubshaft forward lean, and most of all, the motion of the hands through impact.

Here is where you rid yourself once and for all of the old ‘bending left wrist, flattening right wrist’ throwing motion at the ball. And you do it by concentrating on keeping the left wrist flat and accepting nothing less until it is. Only when you’ve mastered the flat left wrist should you expand the program to include the full pivot strokes. That’s because, without it, nothing else works very well, and more information means only more confusion.