Comprehensive and up to date, this textbook on children’s sport and exercise medicine features research and practical experience of internationally recognized scientists and clinicians that informs and challenges readers. Four sections—Exercise Science, Exercise Medicine, Sport Science, and Sport Medicine—provide a critical, balanced, and thorough examination of each subject, and each chapter provides cross-references, bulleted summaries, and extensive reference lists. Exercise Science covers growth, biological maturation and development, and examines physiological responses to exercise in relation to chronological age, biological maturation, and sex. It analyses kinetic responses at exercise onset, scrutinizes responses to exercise during thermal stress, and evaluates how the sensations arising from exercise are detected and interpreted during youth. Exercise Medicine explores physical activity and fitness and critically reviews their role in young people’s health. It discusses assessment, promotion, and genetics of physical activity, and physical activity in relation to cardiovascular health, bone health, health behaviours, diabetes, asthma, congenital conditions, and physical/mental disability. Sport Science analyses youth sport, identifies challenges facing the young athlete, and discusses the physiological monitoring of the elite young athlete. It explores molecular exercise physiology and the potential role of genetics. It examines the evidence underpinning aerobic, high-intensity, resistance, speed, and agility training programmes, as well as effects of intensive or over-training during growth and maturation. Sport Medicine reviews the epidemiology, prevention, diagnosis, and management of injuries in physical education, contact sports, and non-contact sports. It also covers disordered eating, eating disorders, dietary supplementation, performance-enhancing drugs, and the protection of young athletes.