Everyone knows that regular exercise and weight training lead to physical strength. But how do we strengthen ourselves mentally for the callous times? And what should we do when we face these challenges? Or, as psychotherapist Amy Morin asks, what should we avoid when we encounter adversity? Through her years counseling others and her own experiences navigating personal loss, Morin realized it is often the habits we cannot break that hold us back from real success and happiness. Indulging in self-pity, agonizing over things beyond our control, obsessing over past events, resenting others' achievements, or expecting immediate positive results holds us back. Increasing your mental strength can change your entire attitude. It takes practice and hard work, but with Morin's specific tips, exercises, and troubleshooting advice, it is possible to not only fortify your mental muscle but also drastically improve the quality of your life.