Thank you TaiChiBob for mentioning the Heisenberg Experiments, and the rest of your post. That strain of thought has been running through my thinking every time I hear the arguments against qi (although I think of it as the uncertainty principle).
I won't add much more other than I am in the qi is real, not mystical camp of seasoned martial artists who do NOT FOLLOW the theory of li kong jing as a martial application, agee with the validity of emphasizing the martial aspect of any martial art one trains in, and sees the new age tai chi stereotype as a straw dog advanced by qi skeptics.
The ability to use qi martially is attained like any other skill in martial arts, through hard and long PHYSICAL and MENTAL practice of techniques learned from someone who can demonstrate the efficacy of said technique.
I promised I'd be brief.
Walter
The more one sweats in times of peace, the less one bleeds in times of war.