9 Comments on “Norm Duke’s Learn To Bowl Competitively”

  1. A back-up ball thrown by a right-hander will curve left-to-right, rather than right-to-left as a normal hook is thrown. You might see some of the PBA pros throw back-ups at certain spares.

  2. When a ball hooks the wrong way. When a righty throws a ball that hooks to the right, rather than the left.

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