From beloved performance expert, journalist, and co-author of Peak Performance and The Passion Paradox comes a science-based new definition of toughness-one that focuses on assessing a challenge on a physiological and psychological level rather than fear-based bulldozing-that has radical, holistic implications for any reader.

"Terry Crews spent decades cultivating his bodybuilder physique and bravado. On the outside, he seemed invincible: he escaped his abusive father, went pro in the NFL, and broke into the glamorous world of Hollywood. But his fixation with appearing outwardly tough eventually turned into an exhausting performance in which repressing his emotions let them get the better of him-leading him into addiction and threatening the most important relationships...