I've never been in such/any exercise studios. So I'm pretty ignorant of all this.

(I'm a cheapie..I've taken exercise classes through evening part-time courses for adults via local school board. I've had excellent instructors.)

Would be nice that a forward thinking studio owner would post a nice, not too big poster at back of classroom that espouses the studio's approach/expectations for student/participant behaviour. It can be expressed in an inspiring, brief way if she already teaches and runs her studio based on those values.