Overweight is the result of a complex interaction between several factors, both non-modifiable and modifiable factors. Modifiable factors include food consumption, lifestyle, and physical activity. If childhood overweight problems continue and are left untreated, it will have a significantly worse impact and can threaten their lives in the future. The most effective and safe method to lose weight is by doing physical activity. This study examines the effectiveness of a play-based physical activity model to lose weight for overweight children aged 9-12 years. This study used an experimental method by involving 20 overweight children aged 9-12 years. Bodyweight measurements were carried out in the control group and the experimental group. The collected data were analyzed using a t-test with SPSS 19 software. The results indicated that: (1) there is a significant effect of play-based physical activity on children's weight loss; (2) the play-based physical activity model is effective for reducing children's weight. The play-based physical activity model needs to be developed and implemented in schools as weight loss strategies for overweight children. The results of this study can be used by sports teachers, instructors, parents, and stakeholders to jointly solve the children's overweight problem. Due to the benefits of physical activity for overweight children, other types of physical activity that can be practiced individually without reducing its enjoyment and satisfaction should be further studied and developed.