Why do I say “chi” or “ki” is not real? The main reason is that many people like to claim it is some sort of external “force” or “energy”.
Most of the effects which are often attributed to “chi” or “ki” can be simply explained by CBM: “Coordinated Body Motion”. Some systems and styles call this “Single Unit Moving” or something similar.
That being said, some demonstrations of “ki” and “chi” are simply BS. It usually involves people who want to believe and are either consciously or subconsciously going along with the techniques, just like they do with the Dillman-style “no-touch knockouts”.