Ericsson, Krampe, and Tesch-Romer's (1993) framework for the acquisition of expertise described deliberate practice as training most relevant for the improvement of performance within any domain. The object of this study was to specifically test Ericsson et al.'s (1993) definition of deliberate practice with Canadian middle distance runners. Eighty-one runners rated lists of track practice activities, track-related activities, and everyday activities according to each activity's relevance for improving performance, the amount of effort and concentration required to Perform each activity, and bow enjoyable they considered their participation in each activity. Contrary to the original conception of deliberate practice, results indicated that the most relevant and the most effortful activities were also perceived as most enjoyable. No significant differences were found between national provincial, and club performance groups in terms of the athletes' perceptions of the activities. Finally, middle distance runners' practice activities were identified according to a modified conception of deliberate practice for sport.