In February 1944, Tohei was sent to occupied China as an infantry leader. In the harsh conditions of wartime — with no doctors available — he began developing practical principles for healing through extending Ki via the fingertips. These field-tested methods would later become the foundation of Kiatsu.
After the war, Tohei systematized the method based on the Four Principles of Mind-Body Unification that form the foundation of Ki-Aikido. In 1971, he founded the 氣の研究会 (Ki no Kenkyukai — Ki Society). In 1980, he established the Kiatsu Ryoho Gakuin (Kiatsu Therapy School) at the Ki Society headquarters in Tokyo, creating a formal training path for Kiatsu practitioners. In 1983, he published his book "Kiatsu," documenting the complete method.
Today, Kiatsu is practiced and taught by Ki Society (心身統一合氣道会) and at dojos around the world. It remains an integral part of the Ki-Aikido curriculum, reflecting Tohei Sensei's vision that mind-body unification has practical applications far beyond the dojo.