Ilchi Lee says through his new book
When your airways are blocked, breathing stops. When your meridians are blocked, the flow of Ki stops. And just as you feel stuffiness in your chest when breathing is impeded, you feel stuffiness throughout your body when the flow of Ki energy is blocked. If one is not yet consciously sensitive to the flow of energy, he or she may experience a psychological blockage, or burden of the heart, when the flow of energy is blocked. If one is consciously sensitive to the energy flow, the specific areas of the body in which the exchange of energy has been impeded may be felt. Such a person will even be able to diagnose the state of the energy in his or her own body by color, smell, temperature, and other measurable factors.
If blockage of energy flow becomes chronic, then the stagnant energy that has not been released from the body becomes a probable source of illness and disease that will eventually be physically expressed. From an energetic point of view, the presence of disease indicates that the body has been cut off from the flow of life from the universe. If you are immersed in the great sea of churning universal energy, connecting body and mind to its infinite flow, then you cannot become sick even if you want to. Brain Respiration training teaches you to consciously form, maintains, and utilizes that connection to cosmic energy.