The bowling style has constantly changed. Many people are trying to play by the text book style, and are trying to stay away from things like, "open shoulders, not being squared, drifting, dropping the shoulder." Thins like that. Althought that textbook style may get you high games, how many professional bowlers do you see on TV that have a textbook style? Most of the bowlers on tour have styles other coaches wouldnt recommend.
Now the opening of the shoulders and closing them at the line is fine, but yes, opened shoulders at the line help to create something I call the swing margin. Opening the shoulders, for most people. help them to create more power and revs on the ball at release.
Dropping the shoulder usually is a bad habit, but there are people out there who benefit from this. My dads philosopy is "It does not matter how you get to the line, just as long as it works for you."
But like I said, most of the top PBA bowlers dont really have a textbook stlye, but instead they have a creative style. Some of these bowlers include:
Brad Angelo
Walter Ray
Mike Scroggins(fast feet and no backswing, something most people do nto suggest)
And 97% of the bowlers open theyre shoulders, drift, crank the ball, and all those wonderful "non-textbook" things.
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