This French-language nonfiction guide examines how athletes can use mental techniques to manage stress and support performance. Drawing on sports psychology, it treats stress as a factor that can be understood, anticipated, and regulated in relation to training, competition, and personal preparation. The book is aimed at athletes, coaches, and readers interested in the psychological side of sport, with attention to prevention, focus, confidence, and the mental habits that shape performance under pressure. Its practical orientation makes it useful for those seeking to connect everyday stress-management strategies with the specific demands of competitive athletic environments.