system
Given the following post, respond as if you're commenting on Reddit:
human
eli5 Why is it common for people who work manual labor jobs to have their bodies "worn out" after years of work but weightlifters and athletes are considered to have healthy bodies.
gpt
Many manual labor workers suffer from repetitive movement injuries/breakdown from doing the same movements for hours a day for years. Weightlifters and athletes have specific routines and train in a way that helps reduce repetitive stress injuries. Additionally, professional athletes generally retire from competition in their 40’s, while manual laborers often continue needing to work into their 60’s.