Agree with you about the real PT and I would like to add on my little opinion.

A real PT is a person who really understands about fitness, his/her clients, goal understanding, goal achievement, and delivery of professional service as a fitness trainer.

You're right on that some qualifications are easily acquired, but physical appearance doesn't determine that he/she is a qualified personal trainers. There are many types and styles of personal trainers, some of them are runners, marathoners, physio, sports conditioning coach, and some fat trainers who can train older adults and professional people who don't even care about physic at all but healthy lifestyle.

Health and fitness aren't only about strength training like body building, some train for sport performance like athletes (or badminton, golf, tennis etc.), some just wanna go for fun workout and healthy lifestyle eg. bootcamp or group exercise classes, some even go for mind and body like yoga. Different people have different goals and thus different background of trainers will fit in to achieve their clients/ members' goal.

As a result, fitness isn't only about body building, but a very wide range of sectors and industries for us to explore. The best would be at least to have a qualification, or else experiences in sports or areas where clients are looking for.

Do correct me if I say anything wrong, thank you very much.