Don't let negative thoughts or fear mess with your performance. Psychologist Cindra Kamphoff, who helps athletes and business leaders keep their confidence in high-stakes situations, offers anxiety-busting tools from her new book. Anton Vierietin/Getty Images/iStockphoto hide caption
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In 2012, psychologist Cindra Kamphoff was running a marathon. Then at Mile 22, her self-doubt started to kick in. She remembers telling herself, "This is dumb. Why am I doing this?"