Ballet is so beautiful to watch but the training is insane!  
It really is. Modern ballet is a highly technical art form. Gosh, it even has its own vocabulary - based on French I believe.
I had forgotten the link with French.  Do you know the history of ballet in France?  I wonder when it became popular.
An aristocrat called Catherine de' Medici brought it from Italy to France in, I believe, the 15th/16th centuries.