The question here is: What is meant by harsh treatment? On the one hand, you can’t achieve anything in sport without discipline, but on the other, training sessions shouldn’t be a source of constant psychological stress.

If you think there’s a problem you need to attend training sessions, talk to the trainer, see how different trainers work, find out what demands they make, perhaps talk with other parents and only then decide who you want to train your child.

Prepare your child in advance for the fact that strict demands will be made and they will have to try and meet them, and then see how things work out. Your fears might turn out to be greatly exaggerated.