Famous psychotherapist, lived in Japan before WW2, studied Japanese physical and mental culture. It's an excellent book. I heard about it cruising the back aisles at Budovideo, then found it in the University Library.
From Budovideos:
The classic text on balance, inner calm, and the cultivation of tranquillity using the age-old techniques of Zen masters
• Reveals the psychosomatic underpinnings of Zen, Taoism, and other Eastern traditions
• Provides an alternative to the “chest out-belly inâ€
Hara: Vital Center of Man by Karlfreid Graf Durckenheimer
Moderator: Dux
Hara: Vital Center of Man by Karlfreid Graf Durckenheimer

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