That was a 4:30 class. The 6:30 p.m. is the busiest -- around 60 students. Weekday 6 a.m. classes we have an average of 24. The instructors control the heating, the humidifier, the ozonator, and the ventilator. We have a gauge on the podium that shows the humidity and the temp. Our best gauge, however, is to watch the students. If there are a large number sitting out the postures it's a signal to make adjustments.
I've had an ambulance show up at one of my classes. It was amazing the way the paramedics lifted the patient onto the stretcher using her yoga mat. She had pulled her back out coming out of a pose. There were plenty of people treated for heat exhaustion during training, but none so far in any of my classes.