This two-study project provided a brief description of athletes’ experiences with mind wandering. Study 1 aimed to quantitatively examine mind wandering in sports, in terms of frequency, effects and perceived control. Therefore, 94 athletes (Mage = 19.51, SD = 1.65) answered a specifically designed 19-item questionnaire. The results suggested that mind wandering is a common phenomenon in sports, with both beneficial and adverse effects on performance. Study 2 aimed to qualitatively explore when athletes use mind wandering. Accordingly, 115 athletes (Mage = 22.82, SD = 3.61) described one recent mind wandering situation while practicing sport. A hierarchical content analysis was performed by the first author and confirmed by an external expert. The results indicated that mind wandering occurred in a wide range of situations in sport and physical activity. Nonetheless, it was also argued that future studies should more carefully define mind wandering to avoid confusion with related terms