eng Science and Education Publishing Research in Psychology and Behavioral Sciences 2333-438X 2018-02-09 6 1 9 14 10.12691/rpbs-6-1-2 RPBS2018612 article Maryam Delavar 1 2 Iryna V. Kolesnikova Kolesnikovai@list.ru 2 Maryam Sh. Hosseini 2 Nahid S. Sharifi 2 3 Tehran International and Adaptive School (Girls), Tehran, Iran School is an important environment for mediating children's personal and social development. We aimed to determine the effect of daily colorful playground-based physical activity on some aspects of social behavior among girls in primary school. The study subjects consist of 22 students from two primary divisions of Tehran International and Adaptive School Girls aged between 6 and 7, who were allocated to the intervention (n=12) and control (n=10) groups. The intervention group was implemented through eight weeks intervention strategy, whilst the control group was utilized with daily physical activity on blacktop playground surfaces. The students' emotional sphere, emotional status and cohesion were evaluated using three standardized testing methods appropriately. The results showed that there is lower aggression and conflict, but higher social cohesion between pre and post-test of intervention group. Therefore, daily colorful playground-based physical activity is an essential implement on socio-behavioral adjustment of students during the first major educational transition in primary school. http://pubs.sciepub.com/rpbs/6/1/2/rpbs-6-1-2.pdf colorful playground physical activity aggression conflict social cohesion