system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some martial artists yell in movies and at demonstrations?

I feel rather stupid but I just don't get it.

Are they doing it just because it is/has become a stereotype in in film, or does it have any practical uses at all?
gpt
There are many reasons. Exhaling tightens the diaphragm and tenses the body, making strikes more powerful and protects the body from counterstrikes. This is why UFC fighters always make that "tsss" sound whenever they throw a strike.

I am also fairly sure that yelling has to do with rituals used by martial artists to "summon chi" to certain areas of their body. It gets adrenaline pumping and (arguably) enhances performance.