Reaction time is one of the most determinative elements for a successful sports performance. The purpose of this study was to investigate the effect of 12-week feet reaction developing trainings upon feet reaction time of females at 11-13 age interval. Volunteer sportsmen between 11 and 13 age interval who were active in Tokat Provincial Directorate of Youth and Sports participated into the study. The volunteers were totally 22 sportsmen including 11 experimental and 11 controls who have not participated into a programmed physical activity before. To the experimental group, 3-day 30-minute trainings in a week for 12 weeks were administered to develop feet training time as being prepared in accordance with their age. The control group did not participate into any exercise programs during this process. Reaction time measurements were performed to the volunteers twice as before and after the 3-month training through New Test 2000 measurement battery. In comparison of the obtained data, significance test for the difference between two pairs, and level of significance was accepted as p<0.05. At the end of the study, whereas no significant difference was found in the control group, a significant difference was obtained in pre-test and post-test averages of the trainings performed to develop feet reaction when carried out regularly for 12 weeks. We considered that the trainings we performed in the study would increase the performance and provide positive contributions upon foot reaction time of the sportsmen at 11-13 age interval.