system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: if building muscle is caused by microtears then how come we don’t get bruises from doing it?
gpt
Bruises are from tears/ruptures in blood vessels. Muscle growth is from tears in muscle tissue. You can tear muscles without tearing the blood vessels around them. Its like if a part breaks but it's still hanging by the wiring, because the wires inside are still intact - except in this case the wires are your blood vessels.