Re: Is ki just good physics?
I'll say this. I've never personally come across a teacher who used, talked about, or whom I thought used Ki.
I have, however, laid hands on people who, when something they do is really, really good, and very, very light but feels tremendously overwhelming to receive as uke -- start laughing and say, well, I finally did that pretty good, there, huh.
They are joking of course, it wasn't "finally," these people have been at "it" for 30, 40 and a couple for 50-odd years. Of COURSE their stuff seems magical to me, practitioner getting ready to cross the 2 decade mark...