system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:getting the wind knocked out of you. Bonus points for how to fix it.
gpt
It's a spasm in the muscles of your diaphragm.  When there's a strong enough impact, your muscles get temporarily shocked.  Your diaphragm can't move, so you can't draw breath.

To fix it: relax, and wait.  It's gotta reset on its own, not much else you can do.