This Capstone introduces the Inner Teammate framework—a theoretical model of self- partnership informed in part by the author's experience as a U.S. Navy SEAL and designed to support sustainable well-being and adaptive performance under pressure. Drawing from positive psychology, metacognition, emotion regulation, self-leadership, and systems-based models of internal dialogue, the framework conceptualizes the Inner Teammate as a cultivated internal identity that enables wise, coordinated action in real-world complexity. The paper proposes Generative Well-Being (GWB) as a new lens on flourishing, defined as the capacity to metabolize life experience—especially adversity—into increased psychological resources over time. It outlines the Architecture of Agency—a proposed psychological system composed of four interdependent functions that collectively enable and sustain Generative Well-Being in real- world conditions: self-awareness, self-determination, self-efficacy, and self-regulation. These are operationalized through four practices—Huddle, Align, Repair, and Pace—designed to embed inner partnership in daily life. While grounded in established research, the framework is presented as a theoretically informed contribution to be tested and refined through future empirical work. Implications, applications, and research pathways are discussed.