A current trend in classroom management is to hold kids in from recess as a means of disciplinary action. The problem with this strategy, of course, is that kids need recess. They need to decompress, burn off energy and socialize.
I understand that teachers are trying to control their classroom. I know many of the classrooms give rewards as well as take-away reward systems. But taking away a crucial part of a child's learning -- play -- is unproductive when getting a kid to sit still.
Up to a point, we professionals are quite right to note how hard getting to health can be through the obstacle course of the modern day -- for adults and children alike. But there is another story to tell about health, and it is fun. It's all about fun.