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Originally Posted by lagster
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10-13-C says that this Shoulder Turn moves the shoulder "at right angles to the spine." At what ANGLE do you think a FLAT 10-13-B Shoulder Turn moves in relation to the SPINE?
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IMBW but:
Regardless of spine angle, all shoulder turns will rotate at a ninety degree angle to the spine. It may look like the left shoulder dips with a greater spine angle at address but it is still perpendicular to the backbone. Likewise a flat turn will look like it is the only 90* rotation but it isn't.