On "Chi"--
IMHO, most of the demonstrations are as Brian said, a form of showmanship that can be duplicated without the need for "Chi"
I think "chi" is a certain kind of feeling you get from long familiarity and usage of your body under strenuous physical performance. I think it exists as a feeling that is a good indicator of what is happening with your body, but it does not exist by itself as some sort of electrical force, etc.
However, let me digress a bit and say that some of the claims of acupuncture are actually true.
My father is a 60 year old surgeon trained in the western manner, and some years ago, some doctors came from China and performed an operation under lab test conditions here using only acupuncture and no anaesthesia. The patient really felt no pain, and the monitoring instruments showed no sign that the patient was feeling pain.
After that, my father became a believer in certain types of acupuncture. Of course, there are a lot of people who do it without any real skill, that's understood.
As to "chi" in the FMA, I really can't comment on this.
Best wishes from SYK