Bodyweight Exercises For Strong Abs
I'm a CrossFitter, and These Are the 12 Bodyweight Moves I Do For Strong, Defined Abs
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Why I do it: We often hold a plank in class for 30 to 60 seconds, and it's not only a great way to strengthen the core and upper body and increase flexibility in the wrists (perfect for barbell work), but I also love the mental challenge — 60 seconds is a long time!