An aside: much as I enjoy yoga as a way to keep fit and flexible, I've yet to be convinced of its merits as a repertoire of poses for life drawing. Which, FYI, is very common.
Not that the poses based on yoga postures aren't impressive - they are. But they have a certain unreality that I find jarring. It's like the difference between drawing people in their normal clothes and in costumes. Nine times out of ten, I prefer the former.