As a society, we spend a lot of time talking about physical strength. Newsstands are filled with weight lifting and fitness magazines, workout videos generate over $300 million dollars a year, and TV commercials are dominated by the latest fad diets and weight loss supplements.
Mental strength has certainly never attracted that much attention. Yet, without mental strength, we aren't likely to reach our physical fitness goals -- or any other goals for that matter. Building mental strength is the key to reaching our full potential in life.