system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do organs like our heart get stronger under stress like working out, but organs like our kidneys get weaker under stress like doing drugs drugs?
gpt
Because the word "stress" means different things in those contexts. The heart is a muscle and muscles are designed to get stronger the more they are used. Therefore working out causes your heart to work faster and harder and thus it gets stronger.

Your kidney is a filter. By running more/harsher substances through it, it damages the filter more/quicker.