I advise you not to take the initiative. This feeling is more like an illusion, just to let you sign up for his class in the future.

The fitness instructor must have a good relationship with each student before he can promote his courses, so his good attitude towards you is professional, not specific.

And even if I like you, are you that practical to associate with him? He will contact so many classmates every day in the future, and it is inevitable that he will be a classmate of the opposite sex.

Of course, it's not that I can't find a fitness instructor as a boyfriend at all, but I always feel afraid that he will be too attractive and robbed by others.