According to the World Health Organization (WHO) definition, health is a state of complete physical, mental and social well-being.So, public health is indebted to the items which are mentioned above. The aim of this study is evaluating the rate of changes in fitness among male students at the ages of 9 to 11 in section of primary school in Babul. Methodology: The method of this study is semi-empirical. Statistical society of this research consists of all male students at the ages of 9 to 11 in

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... ection of primary school of Babul, who are educated in years of 2011-2012. The statistical sample of this study was 80 male students volunteered, who are divided into experimental (40 persons) and control (40persons) groups. Exercise protocol in the experimental group includes 4weeks, each week consists of 2-sessions and in the each session, the mentioned students played soccer game competitively for about 45-60 minutes. We used AAHPERD test which includes (Two round-trip, stand up and sit up, pairs long jump, being hung to the bar-fix, sprint, flexibility and endurance running) for measuring fitness index. Finally, according to the statistical method of independent T, data was analyzed by SPSS statistical software.Results: Results indicate that 4 weeks selected exercising program has a significant effect on the cardio respiratory fitness, scapula muscles, agility, abdominal muscle strength, flexibility and legs muscle strength of students at the ages of 9 to 11 in the experimental group.Conclusion: The significant component of body for playing soccer game is forming during the growing ages. In many sports, determinants of physiological function are influenced by genetic factors. Overall, the most sensitive period of learning the new physical movement patterns is about 9 to 12.