Reiki is a natural therapy that uses hand placements on the body to channel life force energy. The treatment clears stagnant energy in the body and aura that can affect you physically, mentally and spiritually.
Reiki can be used for stress relief, relaxation, assist the body with the healing process and also help with emotional blockages.
On a personal note, reiki has helped me deal with the sudden loss of my father a few years ago, as well as deal with emotional issues that prevented my spiritual development.