The aim of this study was to investigate the effect of therapeutic play training on physical health in 10-12 year old children with back muscle weakness. Experimental research model was used in the study. According to the results of the Functional Movement Screening test, 16 children (8 Study, 8 Control) with back muscle weakness were included in the study as participants. According to the pre-test analysis results, children with weak back muscles were given therapeutic play training with 7 different games adapted to increase healthy posture and physical development for 8 weeks and 3 days a week. At the end of the therapeutic game education application process, the FMS test (post-test) was administered to the children again and the results were recorded. The groups were homogeneously distributed, independent sample t-test was used to determine the difference between the research and control groups, and paired sample t-test was used to compare the data within groups. All statistical values obtained were evaluated at 95% confidence interval and significance was evaluated at p<0.05 level. According to the findings obtained from the study, a statistically significant difference was found when the FMS pre-test-post-test results of the children in the study group, in which therapeutic games were applied, were analyzed (p<0.05). As a result of the FMS pre-test before the education program was started, it was determined that 7 of the 8 participants, who could not reach a sufficient score and whose back muscles were found to be weak, reached a sufficient score according to the FMS post-test results after the applications, and only 1 participant showed positive development although he could not get a sufficient score. When the FMS pre-post test results applied to the control group were examined, it was determined that there was no statistically significant difference p>0.05.