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I don’t know what exercise you’re trying to explain but that is absurd. Your body is not fixed in a push-up. You cannot move the floor down.That's like saying in a pushup you are attempting to push the floor down. You're actually not attempting to move anything, thus the isometric. Your attempting to create maximum tension at a certain angle without using weights. Second the resistance isn't created by the wall, the resistance is created by the difference in your leg strength(and leverage) and arm strength when you are "pushing the wall" but really you are pushing against your own leg strength.
You’re welcome to do whatever exercises you want, I’m not here to put down calisthenics. But don’t debate their limitations with something that is not a calisthenic exercise. If I load up a squat bar with 400kg, and give it my all to move the bar, I’m not doing a body weight movement.