Why do gyms need personal trainers?

I think there are the following points.

1, the needs of the guests, the private teacher has to work. Cater to each other

2. Professional personal education can give advice to guests and help them improve their physical training. Guests will not be as overwhelmed as headless flies.

3, please teach privately, which is equivalent to someone urging and supervising you, so that you will not be lazy and exercise more actively.

Professional personal education can prevent you from getting hurt and teach you to move. Attention is professional.

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I'm thin. I just started exercising, but my chest muscles are concave in the middle. I don't know how to practice.

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