Parkour, the Art du déplacement or freerunning: whatever the name, this new discipline born in the Paris suburbs is rapidly being adopted by people throughout the world. Vincent Thibault approaches parkour as an attractive solution for rival gangs, a force against the overwhelming inertia, and an occasion to challenge one's own fears. Reflecting on the culture of effort, he also avoids the media-based trap that depicts Parkour as just another of those elitist extreme sports.