Steve Siebold, mental toughness expert and author of 177 Mental Toughness Secrets of the World Class teaches that a person of average intelligence and modest means can become world class by implementing the thinking, habits and philosophies associated with this principle. Vince Lombardi believed that mental toughness was one of the most important leadership skills you could attain. Psychologist Angela Duckworth based her life's work on it (she refers to it as grit) and believes that it’s a true predictor of success.


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