The term Qi Gong (or Chi Kung) refers to a set of practices aimed at increasing and bringing into balance the qi, or vital breath. The practice of this discipline gives an improvement in the psycho-physical condition, which is reflected in a better health and immune system response. It includes coordinated practices of: breathing, body movements for the circulation of body fluids and the use of Mind to guide the flows of energy. The whole practice of Taiji is a balanced Qi Gong practice. In fact there are 3 components of Qi (jing, qi and shen) related to 3 different levels of development of the individual.
The first three levels (Earth) in the alchemical daoist practice also cover the etheric field Qi Gong exercixes, related to the circulation of Jing along the energy channels.
Then if it is decided to turn part of the surplus energy generated by the perfect functioning of the physical vehicle into components of more subtle energies (Qi and Shen), it takes part the path to mystical / ascetic / spiritual in the rate and pace that each sees fit.
Otherwise, the thickening of the etheric component simply generates “iron constitution” and a significant increase in its physical longevity. Are not uncommon Masters of Taiji centenarians and perfectly lucid.
Note: The spring force or Jin derived from martial arts practice by the proper use of the mind, coordinated with a released body and proper breathing should not be confused with the Jing, but it is, being the body the grossest component of the etheric field, at most one of his expressions.
The three Treasures, or three Gems (Jing, Qi e Shen) have one principle, yet so subtle it cannot be heard.
Jade Emperor’s Mind Seal Classic