Qi (pronounced Chee) is Chinese for vital or life energy. The concept of Qi was first described in medical writings as well as in archaeological finds dating from 2000 years ago. Qi links Jing (the body of physical aspect of health) and Shen (the mind or spiritual aspect of self), as well as being a conduit between the individual and the universe. In Chinese medical philosophy, Qi underlies all living things and permeates nature. The mastery of Qi leads effortlessly to health in all its physical, mental and spiritual aspects.
Qigong (the practice of Qi) is a systematic method involving personal moral training and mental & physical techniques. Mastery of Qi requires a respect of nature and goodwill for all living beings. It presumes a holistic Taoist philosophy.
It does not require or reject other religious perspectives. The practice of Qigong goes further than the techniques of meditation, yoga and Tai-chi. It involves static stances and movements, active and passive internal imageries and the use of intention.
Qigong has not been widely understood until the past 30 years, when the healing abilities of practitioners were documented through controlled measurable external Qi energy has been demonstrated.