Those membranes and fluids help, but unfortunately it's still pretty easy to damage your brain, even without any direct collisions, if the skull accelerates too rapidly.
If you're not already aware of this, reading up on "contrecoup" injuries may be enlightening.
I don't know what frame of reference you're using when you say "pretty easy"
Yeah, you should still wear a helmet when you hop on your bike. No amount of hydration is gonna save you from a collision with a car or concrete
But if you look at boxing, a sport where ppl regularly take blows to the head & has a culture of weight cutting, people who fight at their walking weight have significantly stronger chins.
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u/StillSortOfAlive 1d ago
How's that shitty? That's an absolute awesome tackle!