Resumen El concepto de Grit, que ha sido definido como perseverancia en el esfuerzo y consistencia en los intereses para la consecución de unos objetivos, ha recibido una gran atención por sus posibilidades de predecir el éxito en diferentes ámbitos. El objetivo del presente estudio fue validar la escala Grit al idioma español. Se ha contado con una muestra de 303 participantes, 123 hombres y 180 mujeres, de edades comprendidas entre los 20 y 30 años. Se comprobó mediante análisis factorial confirmatorio que la estructura de dos factores de la escala original presenta un ajuste razonable en la muestra española, tanto para los hombres como para las mujeres. Los coeficientes de fiabilidad obtenidos fueron semejantes a los de la versión original

Background: An important aspect of achievement goals is the persistence and determination that the person possesses in order to achieve it. Spain does not have an adequate instrument for its measurement. First, this article had the aim of adapt and validate the Motivational Persistence Scale of Constantin et al. in a Spanish population and athletes. Second, it had the aim of prove the relationship with deliberate practice and performance. Methods: In this study, 384 university students participated, where the factor structure was analyzed by means of a Confirmatory Factor Analysis (CFA). In study 2 of 169 athletes was used to confirm its validity in a homogeneous population and its predictive capacity on the hours of deliberate practice (DP) and performance. Results: The AFC showed a two-factor structure, reducing the original three-factor structure, presenting a good fit in both Spanish and homogeneous population of athletes and achieving a significant predictive capacity on deliberate practice. The new dimensions were Purpose Pursuing (PP) and Recurrence of Unattained Purposes (RUP). Conclusions: Overall, our results provide evidence that this scale could be a useful tool for the assessment of Persistence in the Spanish adult and athlete population.