摘要:The social relevance of endurance sports has increased motivation to engage in these particular physical activities, associating their practice with a particular lifestyle (e.g., feeling victorious, self-improvement). Therefore, the dark personality traits (not because they are negative, but because they are more hidden), understood as a personal and adaptive response to the psychosocial relationships that athletes establish while practicing these sports. Following these arguments, Grit has been used to trace the response of athletes in their quest to improve performance and endurance in the face of common setbacks suffered as a result of long hours of training. Empirical studies should help to discover how these personality traits can pose real challenges to their adaptation, and what the impact of their psychological response may be in a functional or dysfunctional way (e.g., exercise addiction), in order to classify them as risk or protective factors. Through transversal design, the present study seeks to explore the relationship between Grit and Dark Traits of Personality regarding the appear of Exercise Addiction (EA), in a sample (N=241) of amateur endurance sport athletes (Mage=31.80; SD=9.87). The results show that men not only score higher for addiction levels, but also for narcissism (grandiosity feelings) and psychopathy (coldness) factors. If signs of narcissism and Machiavellianism increase, perseverance efforts grow too, and the likelihood of exercise addiction increases considerably. The conclusions thrown by the results allow us to place consistency in the interest as a protective factor for the EA, whereas dark traits of personality–especially Machiavellianism–constitute a risk factor.