The Universal Life Force or energy that transcends time and space, penetrates all things in the universe, and upon which all things depend for health and life. It has been acknowledged since ancient times. It has been called many names. Prana, Qi, Ki, Spiritus and the Astral Light.
What do you call it and what is your definition?
Qi or Ki is the same thing, or even Chi. We also categorize chi in many categories but mainly into pre-heaven chi and post-heaven chi. the pre heaven chi are energy that you are given when you are in your mom's tummy, the nutrition and stuff that give you the vital energy. Post-heaven chi are chi that you consume by eating and drinking or breathing or any other source AFTER you are born.
On top of that, pre-heaven chi are chi or energy that is not affected by earth element, which is outter space energy. Post heaven chi is about chi that is on earth and affected by earth element. If you like to read, dig up on the pre and post heaevn bagwa theory here, it is not about a HEAVEN too.. it's just a name: