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The Dragon Flag
Forget all these fancy core exercises. Here's an old-school classic that will hammer your core into submission.
Dangerously Hardcore

Livespill Chaos

Livespill Chaos

Livespill Chaos

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Al Kavadlo, CSCS is a personal trainer, group fitness instructor and author of three books, including Raising The Bar: The Definitive Guide To Pull-up Bar Calisthenics and Pushing The Limits! - Total Body Strength With No Equipment. For more information, go to www.AlKavadlo.com.