In addition to sociological investigations of global, national, and local resistance, contributors present case studies and first-person accounts of struggles to challenge structural barriers and interpersonal hostility. Challenging policy-makers' binary definitions of males and females, the dominance of the achievement model, and toxic masculinity within sporting subcultures, the book explores how trans and nonbinary athletes not only resist transphobic policies and practices but also create new models of inclusive sport. The book has important implications for gender-inclusive policy development. Contributors present new methodologies and ways of theorizing the complex relationships among sex, gender, and sexuality in the equally complex terrain of sport and physical activity.