Researchers have identified schools as important settings in which to create environments and policies that promote healthy weight in children. Yet more attention could be paid to the after school context, particularly in California where Proposition 49, the After School Education and Safety Program Act (ASES), increased state funding for after-school programs from approximately $120 million to $550 million.  The purpose of this project is to determine whether the MO Project-a 2-year after school-based intervention program targeting physical activity and youth advocacy behaviors-can effectively reduce risk factors associated with childhood obesity and type 2 diabetes and in middle and high school aged youth.  This research uses quasi-experimental methods to evaluate two afterschool curricular health interventions-Hip Hop Health Communications and Promoting Health Activities Together (P.H.A.T.)-aimed at changing school policies and other forms of youth advocacy in order to improve physical activity.  The study population consists of adolescents aged 13-18 participating in the MO Project in three sites (Northern, Central, and Southern California).