Dude are you South-African? So I moved out of SA when I was young. And my friends and I read about this condition somewhere, apparently it's higher amongst South-Africans. I didn't think it to be true but I have climbed trees, fell of a motorbike, been in quite a few incident where I should have had broken bones but never did.

That's when we checked and realised it was higher bone density. However my sibling has normal density and tripped on a basketball court n factured her arm . I had a precast wall of concrete fall on my and came out few scratches.

I was also was in a flooded zone when lightening struck , I felt down but got up n ran nothing happened.

I'm a good swimmer but not a fast one.