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Top 10 Core Variations - scientically proven abs exercises
publication date: Jul 15, 2010
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There are hundreds of core exercises to choose from but many just exaggerate bad posture and can be tragic for the spine. My Top 10 Core Variations require no equipment and all have been scientifically proven to get the job done fast in the safest way possible. You won't see any crunches or sit-ups here!