The document discusses parkour and its relationship to the city from a theoretical perspective. It provides background on the origins of parkour and its increasing presence in popular culture. Parkour is seen as having a unique interaction with the urban environment. The document explores using concepts from Deleuze and Guattari like "line of flight" and "smooth versus striated space" to understand parkour's relationship with the city. It also discusses applying Badiou's concept of "the event" to parkour, and how fidelity to parkour as it was originally practiced could be considered maintaining the truth of the event. The commercialization of free running is contrasted with the philosophy of parkour.