I am also a personal trainer. Private education is the cheapest at present 100, which is the current market. Mainly depends on whether the coach can give you a set of scientific fitness methods. It's worth taking you on the road and letting you practice by yourself. A coach is not a doctor as long as he is old. Old coaches are usually rigid and stick to the fitness methods of the 1990 s. You'd better ask him if he has a private education qualification certificate (Asian physical fitness certification). He said you haven't seen the prize. Let him show you the certificate, too.