I remember a great photo sequence in Jimmy Ballard's How to Perfect Your Golf Swing. It was of Tom Watson, 2 photos, one right at the top of the back swing, the second after the beginning of his hip turn on the downswing. The club looks like it is in the exact same position, except it is bent in the second photo. He has already created his lag with that hip move, and that happened very quickly.
I have more luck thinking of lag as shaft bend rather than body position or geometry. Once you bend the shaft coming down, you must keep it bent until after impact.
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