Blessed is an odd word for something you did nothing to earn, and that's precisely why it fits.
You read a road sign from a hundred metres away without giving your eyes a thought. You hear your name across a loud room and turn toward it.
Nobody arranged any of this for you.
A great deal of what works in a body was never on anyone's to-do list. Being grateful for the unearned parts isn't sentimentality. It's an accurate accounting of what you were handed before you had opinions about it.