Gym coaches are mainly divided into personal coaches and group aerobics coaches. Personal trainer's certificate is mainly the national vocational qualification certificate of fitness instructor. This can be said to be the qualification certificate of a fitness instructor. At the same time, personal trainers need to have comprehensive fitness knowledge, such as cardiopulmonary resuscitation certificate, sports rehabilitation certificate, sports nutrition certificate and so on. Group gymnastics coaches mainly have certificates in dance, yoga instructor certificates and so on.