This document discusses ethics in sport and the use of performance-enhancing substances and methods by athletes. It provides principles for an ethical framework in sport, including respect, fairness, compliance with laws, and harm prevention. It considers questions around the role of science in enhancing performance. It examines why athletes may take drugs, such as pressure to win or peer influence, and lists specific illegal ergogenic aids. It outlines ethical dilemmas around intravenous drips, injections, supplements, drugs, and genetic manipulation.