Yes, just look at the publicity of fitness instructor training institutions. For 1~3 months of mass production of fast-food chicken, you still expect them to know better than you. Looking for a coach depends on whether you have a diploma from a sports university or a normal physical education department, or whether you have a provincial bodybuilding competition award certificate. If there is neither, you can judge his figure by yourself. If you can't practice well, you can't teach others well.