Its a form of Holistic therapy a form of healing that considers the whole person -- body, mind, spirit, and emotions -- in the quest for optimal health and wellness. The practice of Reiki is an original method of healing, developed by Mikao Usui in Japan early in the 20th century. Reiki is a natural healing energy that works on every level, not just the physical, and is understood to promote the body’s regenerative self- healing ability.