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The Secret of Rib Cage Expansion: Stimulating Costal Breathing through Exercise by David Willoughby. - YouTube
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Had Both a Huge Rib Cage and Enormous Pectorals”: Arnold Schwarzenegger's Bodybuilding Goals Were Inspired by Another 6'2 Tall Legend - EssentiallySports
Did Arnold Schwarzenegger have unusually broad shoulders and an unusually large rib cage partly because he took steroids as a teenager? - Quora
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