Parkour is a style of movement through the city invented by the Frenchmen David Belle and Sébastien Foucan in the late 1980s and now practiced worldwide. It emphasises fluidity, speed, efficiency and freedom, training traceurs to move as quickly as possible through the city regardless of obstacles. Practitioners frequently interact with buildings in new ways by finding routes, observing details, and confronting problems that ordinary users and pedestrians confined to the sidewalks are unaware of.