have you heard about the internal force called chi or qi?

I've heard a close friend of mine saying about this..it's some sort of energy that everyone has, only strong or weak. and not many people can see other's chi...those that are well trained, probably the masters can see it, and i've heard that it's multi-coloured.

you can't, but some people can feel it and use it for their good. chi is divided by two, yin and yang, represent the contra, man and woman, hot and cold, everyone has this force. by the way, its not the most powerful internal force, the chinese just said it "your internal force", powerful or not, depend to you..