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Continue to ChatAnthony Ditillo, 'The Single and Double Progression Method', The Development of Physical Strength (Wm F. Hinbern, 1982). https://physicalculturestudy.com/2019/08/16/anthony-ditillo-the-single-and-double-progression-method-the-development-of-physical-strength-wm-f-hinbern-1982/