Ya know, if someone can actually do the sorts of thing that some people claim to be able to do, and can do them in controlled, repeatable, measurable fashion, there's probably a Nobel in their future.
However, so far, we got no proof. No repeatable, measurable, quantifiable results. Just hearsay and bragging and posturing and sometimes something interesting happens that cannot be repeated under controlled circumstances.
Ki/Chi/Qi is shorthand for good ergonomics, good body mechanics, tight focus and intelligent application of force. Not much more.
Legend and myth are fun, but they don't hold up to scientific scrutiny.
It's easy to believe in the esoteric, but taking a realistic, scientific stance and measuring, evaluating, researching and defining what is being done is the trick.
If it don't stand up to scientific scrutiny, it's probably prestidigitation.
Don't get wrapped up in the woo. Train, enjoy, pass it on. Don't delude yourself or anyone else.
cg
(A skeptic who is open to proof and evidence, but ain't holding his breath and who has studied budo for about 35 years and has yet to see any real evidence of anything resembling supernatural forces) ...