The aim of this study is; to investigate the effects of differential training method on hand and leg visual reaction time in high school tennis trainees. 24 trainees (12 girls, 12 boys) attending a tennis course in a high school participated in the study voluntarily. It was determined that the mean age of the participants was 15.00±0.00 years, their body weight was 63.46±10.64 kg, their height was 1.65±0.06 m, and their body mass index was 23.26±2.91. According to the results of the pre-tests, 2 homogeneous groups of 12 people were created. One group formed the Differential Group (DG), the other the Traditional Group (TG), and each group included 6 girls and 6 boys. The training sessions were held 3 days a week (90 minutes each) and lasted 10 weeks in total. In the study, the visual reaction time (separately for hand and leg) was performed as a pre-test and a post-test using the Fitlight Trainer[TM] device. Paired Sample t test was used to examine the difference between pre-test and post-test of the same group. Independent Sample t test was used to measure the intergroup interaction between pre-tests and post-tests. To interpret the statistical significance level, p < 0.05 was accepted. As a conclusion; it was observed that both training methods shorten the visual reaction time, but there was no significant difference between the groups in pre-test and post-tests.