When I was at primary sochol the boys were kept apart from the girls in a separate playground. I'm not suggesting this at our sochol and when I look back on it did seem rather strange, even then. I don't remember us boys doing anything other than just rush around or grub around in the playground dust. The girls did all the interesting games, skipping and rhyming games whilst throwing balls against the wall. At the end of break we all had to line up QUIETLY (hint hint!) and the headteacher would come and inspect our hands to make sure they were clean!!