eli5: why do humans brace for impact if going limp results in fewer injuries?

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Why is our instinct to brace for impact when falling, getting punched, getting into a car accident, etc., when going limp causes less injury/damage to the body?

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Anonymous 0 Comments

Because it doesn’t result in fewer injuries? Where is that coming from.

Bracing and protecting from damage is a vital part of surviving many dangers. If someone wants to punch you and you take that in your chin instead of covering with your hands or forearms you might get knocked out.

If someone tries to stab you, way more likely to survive with a lot of cuts to your hands instead of your torso.

I guess I am not sure about ejecting from a car, but you likely survive better by not falling on your head.

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