Alongside any mechanical things state – it’s additionally some combination of placebo and adrenaline. An almost primal scream, grunt or roar comes naturally when you’re trying to operate at your upper limits. In the same way that screaming seems to reduce your pain if you’ve hurt yourself, again partly due to adrenaline.
Tennis players grunt, people swinging swords probably did a lot of roaring (for other reasons too), someone being nearly crushed by a large object will roar/scream as they’re holding it up
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