When faced with a threat, humans react with one of three instinctive behaviors: fight, flight, or freeze. There are so many variables that play out into a particular outcome, and most of them are out of your own control—but there is one game-changing variable that is completely within your control when you face threats of any kind: your mental toughness. Guest author Trey McCalla unpacks this game-changing trait, and tells us what it really takes to get it.