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the purpose of this study was the comparison effect implementation methods physical activity outside of class on the physical fitness of 15 y. boy students. method of study was quasi experimental and statitical population of that includes all of the 15 y. boy students of  maraghe city(n=2865). sample of study was 80 pepole who were selected of sample available and then randomly in four groups of 20 people called as experimental group 1, the method on based students self-supervision, experimental group 2, the method on based parentals supervision, experimental group 3, the method on based physical education teachers supervision and controll group that were homogenous. at first a pretest was done from the four groups by pull up test, sit and rich test, sit up test, 540 meter running test. implementation methods physical activity outside of class were done on groups for 8 weeks and then a post test was done from four groups. for statistical analysis of multivariate analysis of variance was used for comparison mean between groups.The results showed that the method of enforcement activity outside of class fitness factors of boy students, there are significant differences ( p≤0/05).however, The results showed that the method on based physical education teachers supervision had a  more impact on physical  fitness  related to health.

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In this correlational study, physical activity of girls’ has been predicted using ecological approach. For this purpose, 374 girls aged 10-12 years selected and completed Self-report questionnaire and physical activity children with reminders 7 days (PAQ-C), Perceived physical competence questionnaire (PPFS), Perceived School Climate Questionnaire for physical activity (Am & et al,2005) and Social Support Questionnaire (Grier and et al, 2008). The BMI index and Lincoln Oseretsky Motor Skills Test was calculated for all subjects. Multiple regression analysis showed Children's fitness, physical competence, perceived climate of the physical environment and social support of  friends and family (social environment) are significant predictors for amount of children's  physical activity (P <0.5). In this regard, based on effect coefficients it would be say that Fitness (10%), physical competence (15%), Motor Skills (12%), physical environment (23%) and social environment (24%) can predict children's physical activity. According to results, it would be suggested using the well- known ecological variables to predict children's activities.