We have a special treat for your core from directly from Shaun T. He's a Beachbody super trainer and creator of Insanity and Shaun Week, and he knows how to strengthen and sculpt abs. This workout is short but specific, and the only equipment you need is a chair. Yeah, leave it to Shaun to find an exercise that will make your midsection quiver while sitting down. If you want more, check out Beachbody on Demand.
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