system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do people moan when stretching?

Something that has always got me thinking.
gpt
Lungs are controlled by a belly muscle.
You stretch, your belly muscle moves, your lungs move and air comes out yer' gob, Couple this with the chance that your necks moving for a stretch and the air out yer gob is gonne make a noise.