Warning-weight training rant
I really think that the fact we don't bounce off of pavement (like kids do) is another good reason to weight train. Get those bones up to their max density so that falls aren't so catastrophic. Not to say that the poor lady who broke her pelvis did anything wrong - she may have landed in such a manner that she would have been seriously injured regardless. But, it's like buying insurance for your body. Especially for those of us who are pushing 50 (but keeping our cadence up! Don't want to blow out those knees!)