Dan is reported to be able to stand in an ordinary stance and not only not be pushed over, but make the one pushing him become weak and unable to lift his feet--or make him fall. And he is said to be able to generate tremendous penetrating impact with almost no motion. Likewise for Mike Sigman, according to no less than George Ledyard. And you can see videos of Akuzawa doing some pretty eerie stuff.
Just to throw in a universal caution. All of these skills are ultimately physical skills that take training. Tohei "is reported to be able to stand in an ordinary stance and.... not be pushed over", too, but that's within limited parameters. A slow-moving 1955 Chevy pickup would run over him. So there are limits to all of these grand-sounding skills and there are levels of ability and so on. Let's keep it real out there, folks.