Thank you all for your replies.
I've been studying Traditional Chinese Medicine and its application to Qi Gong for the past few days quite intensely. I realize what they call Qi Gong, although its name translated to English is "breath work", it really means "Energy work". I now realize my question was too general because there are so many kinds of qi gong.
Thought it was interesting so I decided to share some things I learnt...
It's divided into 5 areas and their representative analogies:
- Qi (soldiers)
- Breathing (strategy)
- Mind (command)
- Shen (morale)
- Body (battlefield)
Hence qi gong is: Using the command (mind) to control the strategy (breathing), cultivating a high morale (shen), hence moving the soldiers (qi) effectively across the body (battlefield).
Qi when moving outwards forms the aura that shields against external influences. Qi when moving inwards manages the health of internal organs. Hence learning how to use the various factors above properly can help to preserve health. Qi from food and air comes from the diaphragm muscle (Middle Dan Tian). Qi from original essence from parents comes from the enteric nervous system (Lower Dan Tian). Shen, the commander, resides in the brain (Upper Dan Tian).
jay.validus mentioned "energy from kidneys". I believe the kidneys store "Yuan Jing" (which means the original essence contributed by our parents). This is normally converted to pre-birth Qi, which is stored in the lower Tan Tian.
gandarloda mentioned the method for gathering chi into the lower Dan Tian.... Do you mean using regular abdominal breathing (yang pushing outwards while inhaling) or reversed abdominal breathing (yin moving inwards while inhaling)?
I'm a little confused about how Qi Gong reconciles with Buddhism though. I know Tao Te Ching says something like: "Convert jing to Qi, Convert Qi to Shen, Convert Shen to emptiness." From mapping across to Buddhism, I find that if the yang Qi rises, it gives off very similar results to the spiritual crisis talked about here - with an agitated mental body and bad emotional waves. Then the "Yi mind" (or rational mind) has to calm the emotional mind, remaining in equanimity to raise the spirit.
Apparently they call people who can raise their spirits out-of-body as "immortals" or "Shen xian", meaning that their spiritual bodies have sufficient power than the average person. Enlightenment in their context is never needing to take birth in a physical body again, becoming the divine.
I will try out your methods and see what I get experientially. I think qi gong really has more in common with this than what I previously thought...