An Introduction to Koichi Tohei (1920 - 2011) - 10th Dan aikidoka and founder of the Ki Society and its style of Aikido, Ki-Aikido. Practitioner of Shinshin-tōitsu-dō (Japanese Yoga).
Books: https://www.goodreads.com/author/show/248718.Koichi_Tohei
Videos: Intro - Ki Aikido - Fundamental Concept Principle Part1 - Part2 - Part3 - Part4 - Part5
Tohei trained with Morihei Ueshiba - Japanese martial artist and founder of aikido.
