If they are acting up, not behaving, they will set them out, sometimes, they have to sit in the lobby. If it is bad enough, we will be called to pick them up. You really don't see it much, not that my dd is in Level 5, you see it more with the younger kids on preteam. You don't see it at all with the older kids. If a child is not listening well, the coach will call the mom in for a conference. I have seen girls dismissed from practice for being mean to team mates, but I hate to see that because most of the time there are 2 sides to a story, and one usually gets punished.
Some minor thing, they may have to run or do 10 pushups, etc..