FOR THOSE THINKING OF TRYING IT ...
1) Yes, MJ and company REALLY DID do these ON STAGE--it' NOT Photoshopped.
2) They had FOOTHOLES built into the stage.
3) The shoes had SPECIAL PLUGS that would LOCK into the footholes, so once they did the shoe wouldn't move until the dancer slid it BACK out.
4) EVEN WITH THAT, the dancers had to BUILD UP THEIR CALF MUSCLES to be able to handle the strain from their body being that much forward.
5) WITHOUT footholes and special-lock shoes, if you try it you'll just fall forward.
6) WITH footholes and special-lock shoes (or some other way to hold your feet in an unmovable position) WITHOUT THE EXERCISE you'll TEAR SOME MUSCLES.
