“The Strong is the Beautiful” and “At least once in his life every man will dream of being the strongest person alive” are the two pillars of thought that make up my understanding of the world
It looks like the same author also wrote a book on "The philosophy of practical experience: the way to a philosophy for the world's strongest life" (or something to that effect) with Yujiro Hanma from "Baki" on the cover.
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And I certainly wouldn't put that age limit at 25.