Otherwise known as Chi-kung, it is a Chinese traditional practice for health maintenance, a spiritual component of martial arts and a mind/body therapy.
Qi means "energy" or "life force" and Gong means work or skills. Originated with Taoists and Buddhists monks and martial artists ( and their students), Qi-going is working on the vital energy/life-force of the practitioners.
It is considered a part of traditional Chinese medicine.
It's main uses are for:...re-energizing vital energy.