Not much to add today, but I did come across this video of Dame Alicia Markova, apparently in practice. There are no huge extensions here, but once your eye adjusts you will marvel at her delicate lightness and classicism.
This, folks, is what ballet used to look like.
Here’s another video I discovered today, of Dame Margot Fonteyn as Odile:
Again, a satisfying lesson. (BTW I take back much of what I said in an earlier post about her feet and extensions — these comments were based on videos of her in her declining years, which was the only reference point I had at the time. At the height of her career, she was undoubtedly great.)