What does it take to be a fitness instructor in a gym? This job is a skilled occupation, so the attribute determines that this occupation needs to pass professional training. For newcomers, to become a fitness instructor, they need to go to a professional and formal fitness instructor training school for systematic study and combine theory with practice. Generally speaking, you can learn all the basic knowledge in about three months. Some short-term training institutions should look carefully and master all the knowledge in a short time. After the course, you need to obtain relevant certificates, which is also a proof of whether you have professional skills. Therefore, if the certificate obtained is recognized by the state, it will be recognized by the fitness enterprise.