Reiki is Japanise word meaning "spiritual energy' or 'universal life-force energy", and in Japan, it is used to describe any form of healing that uses spiritual energy.

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In the West, the word "Reiki" has become synonymous with one particular system of healing originated by a Japanese Buddhist priest called Mikao Usui (1865-1926), who discovered a way of using spiritual energy to encourage healing of body, mind, emotions, and spirit. Usui's system of healing is a safe, gentle, non-intrusive healing technique was Reiki- spiritual energy- flows through a person's hands, which are placed and normally held still specific positions. There is no pressure, manipulation, or massage, and as the energy flows into the recipient it helps to balance, heal and harmonize all aspects of the person - body, mind, emotions, and spirit. The Usui Reiki is more than just a form of holistic therapy, as one of its fundamental purposes is to encourage personal and spiritual awareness and growth.