i went to school with a lot of dancers, and seeing them in rehearsal was a lot more interesting and dynamic than seeing them on stage.
the closest thing to that is dance on film, but that's usually done fairly poorly, with stage conceits.
it's sort of expressive, but non-performative. it's much better that way.
here's a good video with some quotes that address what i'm talking about a bit: http://www.youtube.com/watch?v=tXp7r96UTQ4