If you think about it if you put on 10 lbs of muscle a year, x 10 years.. thats 100 lbs of muscle! Lets take myself for example, if I were to put on 10 lbs of muscle every year for the next 10 years I would be at least 300 lbs in contest shape.. just as big as Gunter! ( same height). Basically, that big cycle is saying that in order to put on 10lbs of muscle a year and become a top pro or stay a top pro ( because bodybuilders are always getting bigger), you have to be taking the astronomical doses he was describing. I think most people would agree that on a good steroid cycle someone could put on 10 lbs within a years time .. am I right? Which leads me to believe that someone on that cylce, if they didnt die or go into debt, would be putting on about 30 lbs of muscle a year! Would there be an excuse not to be?
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In general you need xxx mgs of testosterone based anabolics to maintain xxx lbs of lean mass. With your 500mg cycle example, eventually you will reach a point where you will not be able to increase lean body mass despite continuous use of 500mg per week. This is similar to a natural trainee reaching his natural genetic limit, this limit mainly determined by his natural test levels.
The only way to increase mass at this point is to increase the dosage of testosterone (or add other anabolic compounds such as insulin).
Of course there will be a point whereby increasing testosterone dosage doesn't bring on any additional mass, as androgen receptors have reached saturation.