But if you are faced with choosing your own career, from the perspective of development, it depends on your personal personality, temper and study.
If you are a learning type, I suggest you specialize in equipment, because fitness is a deep knowledge, without research, there will be no results, and you need a lot of professional knowledge, so you need to learn, including physiology, medicine, sports, mechanics, nutrition, interpersonal skills and so on. It's an expert.
If you like to drive students crazy, you will do aerobics, but aerobics competition is fierce and there are few top people. Even if you are top-notch, you have to have money and connections to enter the high-level circle. This is propaganda.
Yoga is relatively quiet, which requires you to have a quiet personality and a certain tolerance. Recently, many people are engaged in yoga teaching, but it is difficult to get a certificate. It takes thousands of training fees to pass, but it still depends on your personal ability.
Sanda is mostly a personal trainer of the club, and the way out is very narrow.
Again, no matter how many choices you have, choose one that suits you. There are thousands of examples here. You know what you are suitable for, and you know best. So you have to find out for yourself that each line has its own characteristics and hidden rules. You should learn to learn and adapt. When your ability reaches absolute monarch, you can adapt it to you.