The book has sold more than 15 million copies[2][3] and, according to a CNN report, it was the "highest ranked work of non-fiction" of the 1990s,[4] spending 121 weeks on the bestseller list.[clarification needed] The book and its central metaphor have become a part of popular culture and the foundation for the author's subsequent books, recordings, seminars, theme vacations, one-man Broadway show, TV sitcom, workout videos, a podcast, men's and ladies' apparel lines, fragrances, travel guides and his-and-hers salad dressings.