A growing number of personal trainers are expanding there scope and teaching group fitness classes to supplement income and help keep group fitness programs running while instructors are out. I recently witness a nail biting tragedy where a personal trainer was covering a sculpting class a argument broke out in the middle of the class, there were people in the back of the room doing there own thing, no cueing, modifications, or class instruction for that matter. We all know that personal trainers are not group fitness instructors… But, would you let a personal trainer teach classes if you did not have an instructor?