Hey Coaster
You obviously haven't read my earlier posts. You're just an arrogant jerk.
There is more than one way of coaching. One is to describe everything with physics terminology, and another is to use terminology that works on the athlete to get him/her to focus on certain things in his form so that he produces specific actions in his technique.
Take for example doing a squat. If you try to push the barbell up that is on your shoulders versus trying to push the earth beneath away from you, you will see that the latter frame of mind/reference makes a lot of difference even if it doesn't make any sense.
And since you want to talk physics, the earth DOES move away from you when you get up from a squat or jump off the earth. That is Newton's Third Law. It's just that because the earth's mass is so huge, the movement of the earth would be immeasurably small compared to the movement of our bodies.
Or doing a push-up. If we think push our bodies up versus pushing the earth away from us. The effect is different even if the latter sounds ridiculous. This is the difference between coaching using physics terminology, which is good to a certain extent, and trying to get your athlete to perform in a certain way by using terminology that effects a certain psychological frame.
Btw, I am not an American, you prejudiced arrogant prick!