 In 2010, the U.S. Preventive Services Task Force USPSTF provided a Grade recommendation B i.e. the service is recommended with moderatehigh certainty of benefit for clinicians to screen children ages 6-17 years for obesity and refer identified youth to comprehensive behavioral programs. The challenge in meeting this objective is the lack of community-based obesity treatments to which to refer, particularly for adolescents. The JOIN program, developed as a collaboration between United HealthGroup and Y-USA is a pediatric weight control intervention targeted toward a broad age range of youth from 6-17 years that is: 1 based on well established and evidence based principles; 2 delivered by YMCA facilitators within a community setting: and 3 potentially scalable nationally. Findings from a 6-month pilot study examining the effectiveness of JOIN demonstrated impressive changes in weight status for school age children, but more modest results for adolescents. The primary aim of this study is to modify the JOIN program to increase its effectiveness with adolescents while retaining its potential for scalability. 