"The kids were motivated, busy and engaged. In my experience, the time children get into trouble is when they are not busy, motivated and engaged. It's during that time they bully other kids, graffiti or wreck things around the school."

Parents were happy too because their children were happy, he said.

But this wasn't a playtime revolution, it was just a return to the days before health and safety policies came to rule.

"It's a no brainer. As far as implementation, it's a zero-cost game in most cases. All you are doing is abandoning rules," he said.

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