Introduction: This study's purpose was to explore youth leaders' involvement and influence on younger program participants in a physical-activity-based positive youth development program (PA-PYD). Methods: A case study was conducted where 16 youth leaders (8 males, 8 females, M age = 13.37, SD = 1.36) and 15 program participants (8 males, 7 females, M age = 10.53, SD = 1.12) from four sites of a PA-PYD program in Canada participated in one-on-one semi-structured interviews regarding their program experiences. A deductive-inductive thematic analysis was conducted. Results: Five themes were identified: (a) learning and building skills, (b) receiving support, (c) enjoyment, (d) relatability, and (e) challenges faced. Program participants shared several ways in which the youth leaders they interacted with had a positive influence on their personal experiences. The youth leaders' perceptions largely aligned with those of the program participants. Conclusions: This study provides insight into the value that youth leaders can bring to youth programming.Positive youth development (PYD) programming focuses on helping youth enhance their well-being and fulfill their potential through the development of life skills (e.g., decision-making, communication, confidence;Danish, Forneris, Hodge, & Heke, 2004;Lerner et al., 2013;Spencer & Spencer, 2014). These programs often target at-risk youth who may face barriers (e.g., from families living on low-income, living in resource-poor neighbourhoods, lack of access to transportation) in accessing resources for their health and well-being 1 (Keating, Tomishima, Foster, & Alessandri, 2002). Such barriers can lead to negative outcomes like disengagement, poor academic performance, low rates of physical activity, drug and alcohol abuse, poor emotional well-being, and high rates of delinquency (