Overweight and obesity are unhealthy fat accumulations. children aged 2-18 are deemed overweight if their body mass index (BMI)/Age is ≥ 85th - \<95th percentile and obese if \>95th percentile. BMI measures obesity but not body fat. Lean and fat mass are not distinguished by BMI. Body composition includes total fat, fat-free mass, bone mineral, and water. Obese children have more body fat, lean body mass, bone mineral, and body water but lower lean body mass. aerobic physical exercise changes the body composition of children with overweight and obesity, but research on the effect of aerobic exercise on all body composition variables in Indonesia has never been done, so researchers will investigate its effects.