This book addresses cross-cutting aspects of sport that engage important foundational questions. Who benefits from sport? How does commodification drive sport development and meanings? What boundaries determine fan and participant? The contributors to this volume are interested in sport’s social, political, and economic influences and roles, and show that the answers have many layers. Sport encompasses far more than the elite and professional levels that generate mass passions and large bank accounts, and impacts individuals in varying ways. The boundaries referred to in the title are thus not the typical, geospatial boundaries that define our world but the limits and possibilities that are attached to and derive from sport. The events that comprise sport and the commodification that attends to it shape those limits and possibilities, and create the understandings that define both what sport is and what we want it to be.