That said, I spent my childhood outside and never broke a bone myself, but my brother did and ended up having to wear orthotics the rest of his life and routinely experiences discomfort as a result. So, my advice, don’t limit your kids, but teach them to be careful at the same time.
I’m pretty sure if one of my kids break a bone, I’m going to be a wreck.
EDIT: Your comment about boys breaking bones more than girls is ridiculous, as a parent with a daughter who loves risk taking, I can assure you it’s not a boy vs girl problem.