Primary fitness instructor (after formal training, he has reached the required standard hours and obtained the certificate of completion); Intermediate fitness instructor (working continuously for more than 2 years after obtaining the primary vocational qualification certificate of fitness instructor); Senior fitness instructor (who has worked continuously for more than 3 years after obtaining the intermediate vocational qualification certificate of fitness instructor); Instruct division-level fitness instructors (those who have obtained the senior professional qualification certificate of fitness instructors and have worked continuously for more than 5 years).

The most important duty of a fitness instructor is to help customers become healthy. Customers who come to exercise need scientific fitness guidance to get healthy. Therefore, a fitness instructor should have professional knowledge of human anatomy, physiology, medicine, nutrition and sports skills, in addition, he should also know psychology.

Because a coach should be good at communicating with customers, he can accurately understand the needs of customers and provide help. Being well-informed is the minimum quality of a fitness coach. For example, in order to achieve the best effect of fitness exercise, the coach should also be a "personal doctor", who should have certain health knowledge and understand the diet, work nature, sleep quality and so on of the members.

Develop different training methods for different people. At the same time, however, the knowledge of fitness coaches provides guidance for members' healthy exercise, and also provides some guidance for post-illness and postoperative recovery, but it cannot replace the doctor's therapeutic function.