When you were growing up, your mother probably told you to sit up straight, because good posture helps you look confident and make a good impression. And now it turns out that sitting up straight can also improve how you feel about yourself, according to a study in the October 2009 issue of the European Journal of Social Psychology. Researchers asked college students to rate themselves on how good they would be as job candidates and employees. Those told to sit up straight with their chests out gave themselves higher ratings than those instructed to slouch while filling out the rating form. Once again, Mom was right.