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swing bridge
An inward swinging door is less of a hazard to someone walking past in a corridor or on a pathway. A door is more likely to hit someone in a corridor, because there is less space to move away from it than in a room. Homes are private spaces and the inward swing of the door helps to provide privacy, by screening the room from the person entering for a little longer. E.g. For a bedroom , someone accidentally opening the door will not see a changing individual and provide a few seconds of a visual barrier. For public buildings the safety requirement in evacuation is of greater priority, as these buildings may have large numbers of people needing to leave quickly in an emergency, therefore a door that moves with the flow of people leaving is required. The swing of a door to the outside can provide some protection by pushing intruders away from the door.
Actually, if you tested that question, you will find that walking up and down the stairs increases the heart rate much more.
Monkeys swing on branches as a way to get from one place to another without having to be on the ground, where predators might be able to attack them.
Giant Barn Swing was created in 2007.