But at least teaching ordinary people is enough.
Never listen to what other enthusiastic coaches in the venue teach. Not necessarily wrong. But unprofessional!
The personal trainer will give you guidance, first of all, the mastery of posture, the coordination of breathing and the concentration of attention, and then explain why you want to do this from the physiological and anatomical aspects. It doesn't matter if you don't understand! Let's make a small analogy to make you understand. Basically in one step. No detours! Because this is the foundation! The foundation is very important!
If you practice by yourself, it's hard to find out if you are practicing right or wrong. It is a waste of time to take too many detours. The terrible thing is physical injury. It's okay if the acute is not serious. If it is chronic, it will fall behind.
The experience and experience summarized by predecessors will make fewer detours, and time is money!
It costs a lot of money to find a coach now.