It’s unclear who invented 21s, also known as the Matrix training system. Some attribute 21s to Dr. Ronald Laura, while others credit old-school English bodybuilder Wag Bennett, an early mentor of Arnold Schwarzenegger. Bennet may have learned about 21s from The Iron Guru, Vince Gironda. Schwarzenegger went on to write about 21s in his bestselling book, The […]
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