A Responsibility Model-based (RM) (Hellison, 2003) cross-age teaching program was developed to promote the leadership of a selected group of youth from underserved communities. The participants, called the "Urban Youth Leaders," were eight 11 to 15 year old boys who taught various physical activity skills to a group of 40 fourth graders for eight sessions in a university sponsored program. The participants were specifically chosen for their potential to take on the advanced leadership and civic role of coaching younger youth. They were recruited from four separate RM-based programs that take place during the school year. The purpose of this study was to investigate the potential impact of this program. Data sources included formal interviews, field notes, and lesson observations to assess effectiveness, possibilities, and barriers of the program. Emergent themes included: program expectations, perceptions of the program, progression of teaching skills, familiarization of a university, personal growth, and responsibility development. These results indicated that the program was effective in providing the Urban Youth Leaders a venue to improve teaching skills, become familiar with a university context, gain new friendships, and become confident leaders. Keys to a successful cross-age physical activity program are also suggested.