probably the same thing. a metal stand under the rug, going through his pants like a char, and his hand is probably blocking where the metal meets his pants.
There's people that can sit in a chair balancing on a chair balancing on a chair balancing on a chair balancing on a cliff. Not everybody is average. Not everybody has normal limits.
That's balance on an object, completely different.
There's a reason those people were on display, its all a trick.
The leaning thats in my first gif is PHYSICALLY IMPOSSIBLE without the special shoes like they showed in the post.