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152:. There are a number of variations of jackknife exercises that allow people of different ages and ability to work their abdominal muscles. This exercise can be modified by using an
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raised slightly above the floor. The jackknife is completed by slowly bringing your straight arms toward your
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239:. Australia: Hinkle Books Pry Ltd. pp. 56–57.
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156:. The jackknife can be done by lying flat on your
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272:. You can help Knowledge by
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