If you have a junior high school education, you can also learn fitness coach, because the threshold of fitness coach is not very high. If your height is above 160, your body is free from sports infectious diseases, your age is above 17, your education is above junior high school, and you have independent understanding ability.
Because fitness coach is a skilled profession, what is important is the theoretical knowledge and skill practice of fitness coach. If you have all this knowledge, then I believe that other additional conditions are not very restrictive for you.