In fiction, it's often necessary for characters, particularly those in the superhero genre, to train to fight extreme threats above and beyond what an ordinary person might face. So how does one train to fight supernatural or superhuman threats? By risking one's life in a training area or simulation, apparently. More sophisticated examples will have difficulty levels, starting with "newbie" and ending with "holy crap we're all going to die!" In the most extreme cases, this training area will be just as dangerous or more dangerous than the hero's foes themselves.