Ki energy (referred to also as Chee, Chi, Qui) is the life force that animates all living things. Ki energy is cultivated and controlled within oneself. Ki can be directed externally for the purpose of self defense and attack as in the marital arts; Ki can also be directed internally for the purpose of health and longevity, healing and stress reduction, productivity and creativity, and inner power and spiritual growth as in Sunin Do. Four qualities of Ki energy circulate throughout the body system: negative, neutral, positive and pure. Good health and vitality depend on the predominance of positive Ki energy - the unrestricted flow of Ki in the body. This vital life force has the power to alleviate or reduce the impact of stress and trauma that occurs to the entire system.