system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does muscle grow slow considerably for someone who has been working out for years compared to a new comer / why is it so easy to gain muscle earlier into lifting?
gpt
The human body has a limit to how much muscle you can build (whatever that limit is).

Everytime you hit the gym and gain some muscle, you're putting yourself a tiny little bit closer to that limit, which means you have less room for growing more muscle, which takes more time and effort and energy every day.