"Qigong is a product of the twentieth century, but is rooted in the earlier tradition.
The term is mentioned in the Tang period to designate the "practice of *qi," and in the Song period the "efficiency of qi." In modern times, it has taken on a new meaning and refers not only to Nourishing Life (*yangsheng) but also to martial and therapeutic techniques. As the term qigong signifies both "practice" and "efficiency" of qi, it can embrace all types of techniques, both traditional and modern." from the encyclopedia of Taoism