I Hope for Nothing, I Fear Nothing, and I Am Free

I remember distinctly my Karate instructor growing up telling me the exact same thing after he had kicked me rather hard. Not that we should be punching our learners over and over again. But that you should put people in situations where you design them such that they start breaking down a little bit because it's only in that breakdown that they're able to determine what they need to build back up next. I think a good coach or a good teacher knows what level, what velocity, what power they need to do to get them to where they need to go without hopefully injuring them or making them lose confidence.