Final answer:
The most commonly used performance enhancing drug is anabolic steroids. They are often used to increase muscle mass and enhance performance. Despite being commonly used, it's worth noting that their use can result in severe health consequences.
Step-by-step explanation:
The most commonly used performance enhancing drug is the anabolic steroids. These substances are often used to increase muscle mass and enhance athletic performance. For example, bodybuilders and athletes might use them to gain a competitive advantage. Stimulants, diuretics, and pain killers are other types of performance enhancing drugs, but they are not as commonly used as anabolic steroids. It's important to note that the use of such drugs is usually illegal in competitive sports and can have serious health consequences.
Learn more about Performance Enhancing Drugs