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Why you really need a strong core, for fitness and life - CNET

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And why "strong core" doesn't equal "flat abs."

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The Best Core Exercises For Strength And Stability – Forbes Health

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How to work out on an elliptical: The best tips and tricks - CNET

Core Strength Benefits and Exercises to Improve Your Workout - The

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Seven ways to strengthen your core, Health & wellbeing

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Core strength: importance and maintenance • HRI