What Mike tried to get across is that though in one sense we are all unique and different; in another sense: biologically, physiologically, we are all identical. We all function with the exact same principles: carbon base life form, cardiovascular and respiratory operate the same way for everybody. How we need the same macronutrients for energy, micronutrients for various bodily functions. If this wasn't the case then such a thing as medical science could not exist.
There does exist a general OPITIMAL method for muscle hypertrophy that exists and applies to everyone. The only difference is the specifics and the response. For example, if you have a bacterial infection an antibiotic treatment is the optimal way to treat that infection . This treatment will vary with the individual as well as the response. For instance, I happen to be allergic to penicillin so an alternative antibiotic was use, tetracycline. So though the specific varied the general principle still applied to me as it does to everybody. Of course there are cases where a person, due to a myriad of reasons, are still not able to recover from the infection and even die. But the general principle remains that it is antibiotics that is use to combat bacterial infections.
Everyone needs calories to survive and function. How many calories varies among individuals. So again, when it comes to how things effect the human body the sane general principles apply to EVERYBODY and only the specifics vary. In the famous Miami shoot out, a bullet that blew out the heart of the criminal was still not enough to prevent him from killing three more officers with his Ruger Mini-14. Blood was still circulating just long enough for him to get off a few more shots. A bullet to the thigh of the criminal during the infamous LA shootout was enough to end it right there. Same general principle applied it was specifics that varied.
With bodybuilding the three basic principles are frequency (how often you train), duration (how long you train) and intensity (how hard you train). Those are the necessary ingredients that apply to everybody. Nobody is going to get big muscles without progressive over load (and by progressive I don't mean just more resistance but rather progressive stimuli), for a certain number of times and for a certain amount of time. It's finding the optimal protocol as it applies to each individual. Therein lies the rub.
But trenbolona and HGH makes this all pretty much moot.