If you want to be a fitness instructor, you must have a junior high school education. The height of boys is 1.6 meters, the height of girls is 1.55 meters, and the age is 17 years old. If you are healthy, you can learn a fitness instructor. After you have the fitness knowledge and skills, you can get the industry-recognized fitness instructor certificate and become a fitness instructor. Colleges with large scale, high popularity and good reputation can learn fitness coaches.