Here is my brainstorming:
In Neidan and Qigong like practices, it is understood that to meditate, one needs to breathe in energy into your lower cinnabar field (Jing). It is understood that they need to start from Jing to Qi and then Shen. They believe that circulation is done through the movements of Qigong, Neigong or Tai Chi. These practices are based on traditional Chinese medicine and Taoism.
My thought was to question this and wonder:
Does one really gain energy from breathing in the air?
Why start from Jing?
What is the nature/element of Jing, anyway?
How and why does "one transmute into two and two transmute into three"?
Do those movements in Qigong, etc. really move the energy?
The question that enlightened me was:
What if you are supposed to do something while meditating?
From there, I started concentrating on my "third eye" acupuncture point until I felt that buzzing sensation. Later, I explored my face to find other points, not knowing that these points were acupuncture/acupressure points. Only when they started forming connections with each other, which felt like strings of cobwebs under my skin, did I realize that they take the form of meridians.
As time flew by, I started to get more enlightenments, and all the puzzle pieces started to fit with each other. Wuxing, Wu Wei, Taoism, etc.
Then the answers to some of my own questions from the beginning came to me:
Does one really gain energy from breathing in the air?
The human body gains its energy from cells breaking down nutrients, from the food we eat. Humans obtain energy from three classes of fuel molecules: Carbohydrates, lipids and proteins. The potential chemical energy of these molecules is transformed into other forms, such as thermal (Jing), kinetic (Shen), and other chemical forms (Qi).
Why start from Jing?
Jing (精) means essence and/or extract, but what is it the essence/extract of?
Qi (氣) means gas, air and/or weather. Qi is elemental.
The extract of the elements is Essence. Without Qi there is no Jing. So, one should naturally start with Qi and not Jing.
What is the nature/element of Jing, anyway?
Since Jing is known to give a warm feeling in the guts, and that your body generates heat (thermal) from metabolism, especially after eating. Jing's element should be Fire.
Shen (神) means God, deity, spirit and/or heaven. Lightning is known as a heavenly force to smite demons. Lightning is made of electricity and electricity is a form of kinetic energy. Lightning forms due to positive charged ice crystals and negative charged graupels. Ice and graupels are made from cloud droplets. Therefore, it can be concluded that Shen's element is Water.
Qi is elemental; therefore, Qi is all five elements by nature.
How and why does "one transmute into two and two transmute into three"?
Through Wuxing alchemy.