Which enhancements - pharmacological, genetic, technological - should be banned in sport? How can we ensure compliance with a ban on enhancements? What punishment should those who violate the ban receive? This book offers a new theoretical perspective on enhancement, cheating and integrity in sport. It proposes a trust-based model for motivating compliance, to improve upon the incentive-based model currently advanced by the World Anti-Doping Agency, and examines the philosophical bases for our understanding of justification, motivation, punishment, authority and obligation in sport. A fascinating read for anybody with an interest in the ethics of sport, sport governance or applied ethics.