Personal fitness trainer, whose more important duty is to help customers get healthy, needs scientific fitness guidance to make customers get healthy. Therefore, a fitness instructor should have professional knowledge of human anatomy, physiology, medicine, nutrition, sports skills and so on.

In addition, you should also understand psychology. Because coaches should be good at communicating with customers, accurately understand customer needs and provide help.

In foreign countries, the relationship between bodybuilders and personal fitness instructors is not only a service relationship, but generally becomes friends. Foreign personal tutors will not only give advice on the customer's body shape, but also provide guidance on clothing matching. Some private teachers may sometimes become employers' psychologists. Well-informed is the minimum quality of a private teacher. For example, in order to make fitness exercise achieve better results, the coach should also be a "personal doctor", who should have certain health knowledge and know the diet, work nature and sleep quality of members. Develop different training methods for different people.