Is there a lore reason for why we can fall from great heights?

[Hasrat]

It's explained in the same book of why our character never once takes a dump.

There aren't even bathrooms in your inn room (seemingly)...

Anyway, why would we need an explanation for falling when there isn't one for all the stabbing and slashing and biting and crushing and fire and poison etc etc? Too much realism and we'd be dead by level 5.