So then in our womb state - there is a unification of the shen, qi and jing but when the first breath is taken, this causes the pericardium to change its structure at the heart. So then the Lung as Yang Qi energy of the Po Soul then continues to develop the Jing energy as potential hormonal energy. But this energy is still activated by the Yuan Qi - it is just that the Hun Soul also develops as our left-brain dominant conscious mind (thinking with planning based on the lower emotional blockages).
So the Hun and Po souls are both "yin shen" - and the yang shen is then a projection from our yin qi of our thinking mind - the left brain consciousness. This is why in deep dreamless sleep we access the Yuan Qi again when we experience no space, no time and no body and no mind.
So then the generative fluid is yin jing whereas the yin qi is yang jing - and so the yin qi is what powers the yin shen but with our left brain dominance we are unaware that our spirit as yin shen also creates our yang shen (as our awareness of spacetime - as a holographic reality).
So after the first breath - we slowly begin to lose the heart-mind unification with our body - via the central channel - and so the Hun shen develops as left brain dominance and the Po soul develops as subconscious energy based on the subconscious "yang qi." So that yang qi is also the subconscious yin shen. If we turn the "yin shen" around into the Yuan Shen as virtual photons - then we can restore the jing - since matter is created from virtual photons. So Daoist Master Wang Liping says it takes 6 hours of full lotus meditation a day (with the left leg on top, and the eyes closed - without missing ONE day - for 1 year) - to restore the yuan jing from a middle age man to a 16 year old man.
If Shen becomes Qi, how does Qi become Jing?
And where does the conversion of Qi to Jing take place?
I think Jing seems to have a function of storage of energy (Qi?) but where is Jing found?
So then that subconscious process has to be CONSCIOUSLY reversed - and this can only be done through Quick Fire training - more standing active exercise with deep reverse breathing - to then push the adrenal glands to the sympathetic extreme (thereby reversing the genital gate trigger - the dilation of the genital gate via the prostate). And through the extreme sympathetic then a dialectical opposite PARAsympathetic extreme of the vagus nerve is activated - this then charges up the yang qi again - and sends it back up to the skull. Then through PURIFICATION via the Emptiness via turning the light around - the Yuan Shen that activates the yang shen as a spactime vortex - through the Yuan Qi - then this causes the qi to merge with the shen by rolling the eyes around.
So once the yang qi and yin shen mixes with the yin qi and yang shen (the copulation of the dragon and tiger) then this builds up in the brain as a pressure that overflows out of the sinus cavity as charged up cerebral spinal fluid (the white tiger) - that is then swallowed now as Yuan Qi that is stored in the lower tan t'ien. So the trick is that the Energy is very close to the COMBUSTION source - so the Yuan Qi is actually the "process" of Fire under Water - the Shen under the Jing - and so it can just as easily be reversed - through the above initial Hun soul subconscious visual trigger (or just a spirit-qi interaction with another person, etc.).
So that is why if a person wants to build up their qi - then they have to close off the lower tan t'ien - and this is why the Jing is considered to be the stored up qi in that sense - but in reality it has to be via the middle Tan T'ien as a full interaction with the Yuan Qi of the Universe - in order to really restore the Yuan Jing.