It started as a joke, partly a reflection on my own egocentrism. We loved doing Yoga with Adriene and Benji but sometimes struggled with poses and transitions; the opportunity to watch ourselves while we were doing yoga proved too tempting, the webcam was pointed, meet was opened, then we were off.
From there to recording us was but a step; and from there to fractal yoga, recursively many (just joking -- it was two.) But that was later. First came the mirrors -- by which I mean additional screens, phones, laptops -- showing the same yoga video through the convenient mean of a remote screen connection. This solved the issue of not being able to see Adriene (or, indeed, us) while in a pose facing away from the main screen.
(A screen is unlike a mirror in that it doesn't necessarily flip its image nor require opposition with its subject. But I digress. This could lead to Caramel City.)