system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does it feel so good to "crack" my neck?

It doesn't just feel good physically, but also makes me feel relaxed and almost like I've taken a very short lasting drug.
gpt
It's likely that you've gotten used to the feeling of air bubbles within but it feels better if they aren't present (ie. They would cause discomfort if you weren't already desensitized). That's why it feels better when you pop them ("cracking" your neck).