system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why do muscles take so little time to recover and grow compared to tendons and ligaments?
gpt
The blood flow to ligaments and tendons is far, far lower than to the muscles. This means any growth and or repair is much slower, as the blood carries the vital clotting factors etc needed in the healing process.

The problem arises because the muscles are capable of generating much more force than the ligaments and tendons can withstand - that asymmetry can be dangerous when doing too much too soon. Getting strong muscles is relatively fast, strong ligaments and tendons take years to build up strength - and even longer to repair.