It is necessary, but please ask a coach with teaching experience, preferably a coach who has played games. Some so-called crash coaches don't even know muscle anatomy and muscle position. What can they teach? A personal tutor will follow up after getting the certificate. Don't buy classes, observe their classes first and observe more people. The kind that only teaches members to run laps and only teaches two movements. He only sits on a diamond bracelet. Don't invite him. After his class, you can ask him what effect you want to achieve, find someone who speaks reliably, and ignore those who ask you to buy nutrients and promise that it will be effective in ten days. The important thing is to talk more, ask more questions and hire a responsible tutor.