This coach is obviously playing tricks. When I teach in private, students will be familiar with the equipment in the gym in the first class, including the usage and precautions. After one month's practice, students will teach specific muscle training movements, including training plan and nutritional supplement. If students have any problems, they will focus on changing one class, so they need 20 classes. At the end of these courses, trainees can practice by themselves. According to your coach's teaching method, 10 can only teach a few movements.