Explain like I’m five, how do people new to working out get newbie gains? Why isn’t it just the same amount of progress per session for people who have been doing it for a long time?
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In addition to the other commenter, another factor is this: how strong you are is based on the amount of muscle fibers you have *times* the fraction of them that fire when your nervous system tells them to. Someone who hasn’t trained much gets less complete activation of their muscles than someone who’s been training for a long time. So part of newbie gains is thought to come from better recruitment of existing muscle fibers (which can happen quickly), rather than growth of additional muscle fibers (which happens more slowly).
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