In the early 1960s Dr. John Ziegler introduced the ultimate strength exercise , and Bob Hoffman, owner of York Barbell and While very few sports coaches or athletic directors in high schools and colleges approved of lifting weights, they embraced the isometric system wholeheartedly.
http://www.isegoria.net/2013/04/the-ultimate-strength-exercise/
http://www.isegoria.net/2013/04/the-ultimate-strength-exercise/
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