Tom Cruise does his own stunts in Mission Impossible – Dead Reckoning Part One which doesn't come as a surprise to fans since he pretty much always does.
This time, though, some of those stunts really could have killed him. In fact, one particular stunt in the movie is being called the "biggest stunt in cinema history."
True Tom fans know just how dedicated he really is to his craft, always wanting to get it right. He trains relentlessly for those stunt moments and (so far) has nailed them. Sometimes, he does get hurt, but that hasn't stopped him from doing it again.