hey it isnt really a problem more of a concern, i was run over by a SUV a few months ago. It should have easily snaped my leg in two, because on leg was above the other on concret. the car ran me over once at a tops of 7 miles per hour but the car rested on my legs for a second, i guess deciding if he had hit something(duh) , i went to the Er 15 mins later (my dad took me). When i first got ran over i was in a lot of pain i almost blacked out, but i got up and walked it off like a dumbass. The car whould have run over my chest if i hadnt reacted as fast as i did. When my adernaline wore off it hurt like hell. When i got to the Er i got pain killer and they took x rays. the doctors where amazed becasue there wasnt even a crack in either bone, they said i was in good enough shape and my bones were amazingly strong. I felt some pain afterwards, some really bad fits, mainly when low pressure storms came in. It tend to hurt my leg more. But the day after the accident iwas running. The reason in was run over was becasue i was crouched next to a driveway, petting his dog,and he was drunk and flated me out he was off the driveway and went slightly into the glass, but my legs were on concrete. I have been in other accidents, big falls (i do rock climbing and freerunning) and i heal really fast, becasue im young. But it seems like every bone injury that should easily breaek a strong persons bone im usally ok, never broken a bone dont plan to. But the reason i say this is because im 15 very thin but muscular for my size, and theres not, much seperating skin from bone on some parts of my body. i just want a good anwser not just see a doctor or you have high bone density, id just like to better understand why they dont break. thanks