Who are you? You are the one who could know and perceive. In modern language, thought is the thinker himself. Where are you from? You come from Rulai Zang (Tathāgatagarbha) and you are the origin of the world.
Where does Chi come from? It is all generated by you, who are much superior than Chi. There are different levels of Chi, and you possess all of them. For example, by making Chi flow in Sushumna, you gain a superior level of Chi. Returning to that state, you could immediately experience that spectacular flow of energy.
Empirical practice is a process of going back, not of creation, which is usually involved in chemistry. When we do a chemical experiment, we add a reagent and have a new thing. This is not the case with empirical research, in which we give up or destroy the current conditions. After this, we could return to the flowing state of Sushumna. Remember we originally possess that state, if not, this return is not possible.
So while having empirical practice, we are not adding conditions; on the contrary, we are destroying conditions gradually, to the point where only one condition is left, namely, Rulai Zang, the only real and true thing. In the whole process, you may encounter all kinds of states, encompassing the flowing of Chi in meridians and Sushumna. You only need to adjust your mind to that state, not to clear your meridians or create anything to achieve enlightenment.