system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do you groan when you carry out physically challenging tasks?
gpt
when you flex your muscles intently for a task, you may indeed squeeze the air out of yourself while your throat is configured in a neutral state that would construct a glottal stop when given breath. 

and so, you wince "hnng" as this is the sound of an aspirated glottal stop.