Obesity ranks as a leading chronic pediatric disorder, with estimates ranging from 10 to 25% of the childhood and adolescent population. Physical hypoactivity is prevalent among obese youth and may be an etiological factor. Physical training, with or without nutritional intervention, has been found effective for weight and body fat control. The purpose of this paper is to examine the role that the physician and physical education teacher can play in the treatment of obesity at school. Studies of school-based intervention programs utilizing exercise, nutrition and behavior modification are reviewed. Suggestions are outlined for school-based obesity programs.