I did 50 butterfly sit-ups a day for a week — here's what happened to my abs

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CrossFit - 220111

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Six-Pack Shortcuts: The 50 Best Abs Tips

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Fitness Experts: Sit-Ups Are Worthless, Here's What to Do Instead

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What Happens When You Do 100 Sit-Ups A Day For 30 Days?

I did 50 butterfly sit-ups a day for a week — here's what happened to my abs

I did 50 butterfly sit-ups a day for a week — here's what happened to my abs

What Happens to Your Body If You Do 50 Sit-ups Every Day For 30 Days, Benefits Of Sit-ups

How to Do a Butterfly Sit Ups (and Variations) for a Strong Core

How to do Butterfly Situps