For what I'd suggest is 90% or more of their use case, which is using them to improve muscle mass, strength, or appearance, for your typical gym goer or fitness enthusiast.

When you use the term "recreationally", my assumption is that you are asking about how to use these drugs in contrast to using them in an "addicted" state. Since I am very interested in fitness and physical culture, my .02 is that recreational use is anything where you are not endangering your short term health, endangering anyone else's health or well being, you can afford and understand everything you are using and what side effects and ancillaries you would need to take, and you are taking an amount of drugs that are "way less" than what would be necessary to compete at the Mr.Olympia.