In fact, you don't know the coaching industry.
Physical contact is necessary.
Because the standardization of many movements requires the coach to correct and adjust through physical contact.
If the coach can't get in touch with the members, it will be difficult to guide the standardization of movements.
From your description, he said something inappropriate. If you are uncomfortable, you can tell him on WeChat and ask him to correct the improper place in the future.
He didn't go too far, as long as he didn't touch you, he just touched you, which is still in line with professional ethics.
If you are not used to physical contact, you can tell him that he should stop touching your body at this time.