Sales are made in gyms, health dubs, on campuses, and through the mail. Users report that suppliers may be drug dealers or they may be trainers, physicians, pharmacists, or friends. It's not hard for users to buy the drugs or to learn how to use them. Athletic prowess depends not only on strength and endurance, but on skill and mental acuity. It also depends on diet, rest, overall mental and physical health, and genes.
Athletic excellence can be, and is, achieved by millions without reliance on dangerous drugs.