Yes, as long as you have excellent knowledge of fitness theory, you can carry out targeted, systematic and effective fitness programs for your customers. It is best to have your own fitness experience, so that you can be more in place and let customers understand what you said more intuitively and simply. If you are introverted, it will not affect your professional work too much, but everyone thinks that a good fitness instructor is different, and the same thing is to be professional enough. You have to convince others that you can exercise him into what he wants, and it is the right way, which has reached the basic requirements. As for personality, you can exercise yourself slowly, and you should be confident no matter what career you do!