I think there are two kinds of fitness coaches, one is reliable and the other is unreliable.
Some fitness instructors quit after having several members in a gym, or go it alone and open a private studio. Either you go with him, or it is useless to apply for a gym membership card before. If you don't go with him, you will change your personal education, and then your previous progress will have to start again.
Some gyms try their best to publicize their achievements and let people teach privately. There are too many people doing it. When a coach is too busy, he is assigned to other coaches, and he also euphemistically said: Two coaches will take you together; How is your physical condition? How long did you exercise? These all need to be tracked. One day this coach trains you like this, and the other day that coach trains you like that. You may not know what the result is.
There is a saying: amateurs watch the excitement, while experts watch the doorway; Knowing more about fitness knowledge is good for your own fitness, and you can also choose a good fitness instructor through some "doorways"; On the internet, I slowly groped out the person who refined his figure.