What makes a good coach?

We have now been on the road for three weeks, trainer Sander and me. On the way to RX level and the Throwdown. The fact that I now have a personal trainer produces two kinds of reactions. On the one hand, the people who sigh how nice it must be to have someone who makes you do things that are not or feel really nice, but are good for you. They mainly see the trainer as a talking stick. Others, mostly fellow CFs, wonder out loud why I have a...