Why aren't there more pro's with swings that resemble Fred Couple's?
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At the very beginning of his backswing, he lifts the club up and away from his body with his arms--very unorthodox
His hip and footwork are incredible. I drool over this
The hips moving forward at the top of the backswing and leg extension into impact
You've done zero to prove that his particular golf swing has lead to his bad back, or more so than any other golf swing would have or could have. For all you know, with another golf swing he'd have had to retire at 30.
Of course we can emulate things from his swing, especially if you want to make a centered pivot. He does some unique things with the arms but his legwork and torso motion are awesome. He's a very consistent ballstriker and for him it's a swing that doesn't require a lof of maintenance.