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Core Strengthening Exercises: sophisticated ab crunches in the video series about the best strengthening exercises for your abs and core muscles by John Sifferman

In part 1 and part 2 of this series, I covered plank and rotation exercises. In this video, we are going to go over something a little more familiar – the more traditional ab exercise, the abdominal crunch. I’m going to teach you a more sophisticated version, because regular old crunches just don’t have the

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