Children can burn off excess energy by playing at outdoor playgrounds. They are allowed to play and run around while adults in the area keep an eye on them.

A fence surrounds this playground to keep kids inside and safe. Only the adults supervising the kids may open the gate because the handle is kept high enough. This prevents tiny children from unintentionally opening the gate and escaping into an area where they cannot be easily watched.

@TOP 15 Incredible Inventions That Will Change the Future/Top Fives/YouTube.com