Norris has also ventured into writing, producing a series of books on martial arts, exercise, philosophy, politics, Christianity, western novels, and biography. He has earned income from endorsements and has been the face of several advertising campaigns, including for products such as Total Gym exercise equipment and a memorable series of advertisements for the video game “World of Warcraft.” His internet popularity soared with the creation of the “Chuck Norris Facts” meme, which humorously exaggerated his toughness and invincibility.