the purpose of this meta-analysis of randomized trials was to determine the effectiveness of aerobic plus resistance excercise interventions on body composition related to variables in overweight and obese youth. A computerized search was made of seven databases. the analysis was restricted to randomized controlled trails that examined the effect of aerobic and resistance exercise on body composition (body weight, body mass index, fat mass, fat-free mass, and waist circumference) in obese youth. two independent reviews screened studies and extracted data. weighted mean differences (WMD) and 95% confidence intervals were calculated. Nine studies were selected for meta-analysis as they fulfilled the inclusion criteria