Nudge-Based Exercise Intervention for Adolescents With Obesity

Inclusion Criteria: * Aged 10-19 years. * Body mass index (BMI) at or above the 95th percentile for age and sex according to the Chinese BMI screening criteria for overweight and obesity in children and adolescents. * Able to communicate and understand study instructions. * Willing to participate in the study and provide written informed consent, with informed consent from a parent or legal guardian as required. Exclusion Criteria: * Known secondary causes of obesity, including hypothalamic, endocrine, genetic, or syndromic obesity. * Use of anti-obesity medications, including injectable glucagon-like peptide-1 (GLP-1) receptor agonists, within 3 months before enrollment. * Severe cardiovascular or cerebrovascular disease, severe hepatic or renal dysfunction, or other serious organic diseases that may affect participation or study outcomes. * Psychiatric disorders or cognitive impairment that may interfere with participation or completion of study assessments. * Current participation in another weight-loss, structured exercise, or other intervention program that may affect body weight or physical activity. * Any contraindication to exercise or medical or physical condition that substantially limits participation in the prescribed exercise program.