When it launched the Youth Arts Initiative (YAI) in 2014, Boys & Girls Clubs of America (BGCA) hoped this high-quality arts initiative would address the challenge of attracting and retaining tweens. Research from the first three years of the initiative suggests that it worked: Participants were highly engaged in YAI. This engagement translated into regular attendance: More than half the participants attended the program at least once a week, and two-thirds were retained in the program from year to year. YAI participants also increased their Club attendance, while members who were not in YAI decreased their Club attendance. Furthermore, parents, staff, and participants themselves reported that YAI improved young people's self-confidence and self-awareness and their ability to self-manage, persist, and develop new friendships. This article shares findings from three years of implementation research about how and why YAI was successful in attracting and engaging tweens and about the benefits participants experienced.