It depends on the instructor. Kids class is more structured. Yawning, I don't think ever gets punished or yelled at. No talking though. In adults class we have more leeway. But too much talking and not much training going on. We get more strict as newbies are added so they see protocal but it eases up and becomes no real big thing. My adult class swings both ways and I have learned to just go with the flow rather than fight it mentally. Again it depends on the instructor and his moods, unfortunately. TW