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For the longest time, crunches were a staple in every exercise program on the planet to strengthen the ‘core’ and lead to a rock hard set of abs.
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The Importance of Strong Abdominal Muscles for Your Everyday Life - Wynn Fitness
Top 3 Science-Based Exercises For Six Pack Abs (Upper vs Lower Abs) ft. Matt Ogus
Exercises That Are Better Than Crunches: 4 to Try - SilverSneakers
Are Abdominal Crunches Effective? » ForeverFitScience
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How To Do Crunches Properly For Strong Abs, From A Trainer
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What Are the Benefits of Doing Crunches?
Sit-Ups vs. Crunches
Are Abdominal Crunches Effective? » ForeverFitScience
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4 Reasons Why You Should Not Do Crunches