I went up to Sonoma Mountain Zen Center today, Roshi Kwong was speaking, and it was pretty good. He mentioned that it’s possible to breathe into the sitting and sit longer, but he advised not to continue if injury seemed imminent. I’ve been experiencing a variation on that, which is that the extent of the breath and the place in consciousness can continue the activity of the sitting, maintain and deepen the stretch of the sitting- without direction, almost as though in hypnosis. I guess that’s the same thing he was talking about.