1. Find a reliable training institution (this is very important) to systematically learn the theory and practice of professional fitness and sales knowledge, such as some national vocational qualification certificates, and CBBA will take exams on the way to study. The road to the future depends on your continuous learning and accumulation.
2. Find a master to follow as an apprentice, and then apply for a national ID card and CBBA. (Not recommended, because the master's level and times are uneven, it is difficult to teach systematically, and it is difficult to talk about personality. )
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If you are interested in fitness instructors, I have some information articles you can refer to. It will be helpful to the understanding of the whole fitness industry.