Likewise, counterfeit clubs have been known to fail on impact, have the heads come flying off during the swing, and all sorts of other potentially dangerous mishaps.

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To all intents he had the match in the bag when match referees gave him the 450-yard 10th after Woods moved a tree branch unintentionally during his swing.

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During a swing, the shoulder turns completely while the pelvis remains relatively stationary facing the ball, causing stress on the lower spine or lumbar region, the researchers said.

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