system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do cold showers relax your muscles if they cause them to tense up because of the temperature?

Especially, if you hate being cold like me. Assuming they mean barely-turning-the-handle cold. It feels like glacier water in my shower. I just got a cold from being cold for a few hours. So un-debunking that right now.
gpt
When you have sore muscles it's usually because of inflammation, when you get into cold water, your blood vessels constrict, they get smaller, and less blood is flowing there to help reduce the inflammation.