Grit is defined as the tendency to pursue long-term goals with perseverance and effort, despite adversities or failures. In the context of sports, its effect has been studied using the original Short Grit Scale (Grit-S) without any adaptation. The aim of this study was to analyse the psychometric properties of Grit-S and to adapt to a sample of amateur runners. The sample consisted of 514 middle- and long-distance amateur runners. The results of a confirmatory analysis showed minimally acceptable validity and reliability values for the scale (α=.764), and for each factor (αperseverance=.806; αinterest=.731). Therefore, the psychometric properties of the Spanish version of the Short Grit Scale-Running (Grit-SR) are sufficient to encourage us to continue developing this scale.