system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does ripping apart muscle and building on top of it allow us to lift more weight?
gpt
That's not what happens exactly.  Your muscles do take damage from heaving weight, but your body doesn't "build on top of it."  It essentially "upgrades" the muscle tissue in order to make it stronger and better suited to the stress it is put under.  Your body is good at adapting to circumstances in order to survive.  Musciles get used, it makes them strong.  They don't get used, it make them weaker to use the resources elsewhere.  Lose weight quickly and your metabolism drops to keep you from starving to death.  So forth.