Final answer:
Doping in sports involves using banned substances to enhance performance, posing health risks and ethical issues.
Explanation:
Doping in sports refers to the use of banned performance-enhancing substances by athletes to gain an unfair advantage. These substances, such as anabolic steroids and hormones like erythropoietin and human growth hormone, can enhance muscle performance but pose significant health risks. They are banned by various national and international sports organizations due to ethical concerns and potential health hazards.
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