Background: The literature links anger, physical exercise, and fitness. The increasing trendof violent events in schools must draw more attention to interventions targeted to reducingschool violence. Aim: The aim of current study was evaluating the effectiveness of theimplementation of an exercise regimen program on aggressive behavior among primaryschoolchildren. Subjects and methods: Research design: The current study was carriedout using a quasi-experimental design with pre-post assessment. Setting: The study wascarried out using a quasi-experimental design with pre-post assessment in Governmentalprimary school in Zagazig district, Sharkia governorate, Egypt. Subjects: It included 110primary school students selected by stratified random sampling. Tools of data collection: Aninterview questionnaire form was used to assess student's aggressive behavior towards self,others, and properties. The researchers prepared and implemented an exercise regimen andimplemented it in 12 sessions of 60 min each. The program effectiveness was assessedthrough immediate and two-month follow-up posttests. Results: Students' age rangedbetween 6 and 12 years with slightly more males (54.5%). Statistically significant relationswere shown between students' pre-intervention aggressive behavior and their age (p < 0.001)and gender (p=0.004). The implementation of the program led to significant improvements inall types of students' aggressive behavior at both posttests (p < 0.001). Multivariate analysisshowed that the study intervention was the only negative statistically significant independentpredictor of the score of aggressive behavior throughout the study intervention. Conclusion:Aggressive behaviors are prevalent among primary school students, and this can beameliorated through application of sporting exercises and collective games.Recommendations: The developed intervention should be implemented on a wider scale.Randomized controlled trials are needed for unbiased assessment of the effectiveness of theprogram, with longer follow-up.