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    Plank

    Challenge Your Core With the Reverse Plank – Fitnessnacks

    The garden-variety plank is one of those exercises that many people begin or end their workouts with. It’s simple, reliable, and accessible: Even...

    How to Do the Plank Jack for Killer Abs and Better Conditioning – Fitnessnacks

    No exercise can do it all: Planks are a tried-and-true core-builder, but they don’t burn many calories. The jumping jack — a gym-class...
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