The aim of this study was to determine the effectiveness of physical practices on the reduction of slow-pace children's aggression. For this purpose, 20 guidance school students with slow pace were selected through simple random sampling. They were divided into experiment (10 persons) and control (10 persons) groups. Rosenzweig frustration scale was administered to both groups as the pretest. Experiment group exercised physical practices for one month. Then, Rosenzweig frustration scale was administered to the two groups again. Covariance analysis results showed significant differences (F=40.65, P>0.001) between the two groups. Results indicated a reduction in aggression and an increase in conformity of experimental group. Therefore, regular physical practices can reduce aggression and increase conformity in slow-pace students.