The Flat Left Wrist allows the creation of a Primary Lever which can be Hinged (not necessarily) at the Left Shoulder causing the Clubface and Ball to rotate around the Impact Point which causes the Ball to respond to an Angular Force as though it were struck with a Linear Force.
Only TGM teaches the "How" and "Why".
Above is an explanation "Why" you need a Flat Left Wrist. The "How" is a Completely different matter. First, your "Flying Wedges" must be aligned at 90 degrees through the Impact Interval. Don't try to keep a Flat Left Wrist at Impact while swinging at 100 MPH, because you can't. When the "Wedges" are Aligned at 90 degrees through Impact, the Left Wrist will be Flat no matter how hard or soft you Swing.
The "5 Simple Keys" or "S&T" doesn't teach any of this.
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