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Who the “F” is Christopher Hein, From Aikido to MMA and back again. – Aikido Student.pdf

... In pursuit of his craft, Robbins has ended up incorporating principles from such disparate fields as aikido, sales, and Latin ballroom dancing. He is a devotee of books like Robert B. Cialdini’s “Influence: The Psychology of Persuasion,” and has also immersed himself in the literature of criminal lore ...