"Do you teach yoga?"
Or some variant thereof. (i.e., Where do you teach? Are you teaching yet? Why aren't you teaching?)
My answer has become pull-string. "Well, I've completed 200 hours of teacher training and have been practicing since age 15, but I never had any intention of teaching. I did YTT for me, for the journey."
That's the short answer. This is the long, FUN, REAL one: