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An activity in which participants navigate obstacles (typically the elements of an urban environment, such as railings, stairs, rooftops, etc.) and the spaces between them by jumping, climbing, vaulting, etc., often in a smooth continuous motion intended to highlight agility and freedom of movement. Parkour originated in France, and its name comes from the French term parcours, a shortening of parcours du combattant, meaning "obstacle course." I'm worried the kids are going to break their necks trying to do parkour on the playground.