Reiki is a Japanese relaxation technique and complementary therapy where a practitioner places hands lightly on or just above a person's body to channel energy

 (Rei = universal, Ki = life force) 

Reiki is used for stress reduction, relaxation, and promoting healing, working with the body's innate abilities by balancing energy fields. 

People receiving reiki find it deeply calming, reducing anxiety and pain, some scientific studies show it can activate the parasympathetic nervous system, leading to physiological relaxation.  It is used alongside conventional medicine.