Think of building muscles like blowing up a balloon that has a small hole in it. At the beginning, you start to blow into the balloon, and there’s not much pressure inside yet, so most of your air stays in the balloon, only a little leaks out, and then you blow again, and it continues to let a lot of air in, and a little air out.
Every breath makes a meaningful difference in the size of that balloon, for awhile. But as it continues to grow, each new breath adds less and less total size to the balloon. It’s adding the same amount of *air*, but while your second breath of air maybe added 33% to the circumference, your twentieth breath of air adds maybe 1% to the circumference.
As more and more air gets into the balloon, the pressure builds up, and air starts leaking faster. Eventually (assuming a balloon that won’t pop), maybe 50-80% of each breath is leaking out before the next breath. So that 1% becomes more like 0.2%.
Taking steroids is like giving you more air volume in each breath, and making each breath quicker and closer together, and making the hole in the balloon smaller.
Basically, this system is set up in such a way that there’s a practical limit (determined by your genetics) where you can’t meaningfully add enough muscle quickly enough to continue growing at a clip you can actually see. Steroids just move the limit higher, by making it easier and faster to gain and harder and slower to lose.
Essentially, someone on gear can achieve in, say, 5 years what someone natural would take 100 to achieve. But you can’t actually train for 100 years, so it’s impossible. The number of years is made up, IDK how long it would actually take, but the principle is the same.
So, it accelerates muscle growth, and that acceleration is what allows people on steroids to achieve results that are literally impossible for naturals.
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