"Anonymous. So you are saying nobody dances correctly."
Exactly - show me a picture of anyone, and I will find mistakes in it. And if the dancers pictures are not total fools, they could probably find quite a few mistakes in their best performance as well. Nobody is perfect. But we can all try to be more perfect today than we were yesterday.
"Didn't the mathematician Stephen Hawking say in his book with time everything goes from order to disorder."
On the whole, yes. Eating and breathing while you learn to dance is contributing the overall disorder of the universe at a rate that vastly outweighs the tiny amount of order that you construct by improving your dancing.
"One thing though if you twist your spine and have been doing it like that for a while. You most likely already have degeneration of the spine."
I don't think so... It's a fairly normal human activity, the quantity of twist actually needed being well within the capability of any undamaged body.