Superman (Salkind films) adopted a high protein diet. He added of muscle to his thin frame. He later made even higher gains for "Superman III" (1983), though for "" (1987), he decided it would be healthier to focus more on cardiovascular workouts. One of the reasons Reeve could not work out as much for "" was an emergency appendectomy he had in June 1986. Reeve was never a Superman or comic book fan, though he had watched "Adventures of Superman" starring George Reeves. Reeve found the role offered a suitable challenge because it was a dual role. He said, "there must be some
Superman in film within the set. The first was that the 2.0 audio track on "Superman", was instead the 5.1 audio track already on the disc. The second was that the "Superman III" disc was not the 2006 deluxe edition as advertised, but the 2001 release instead. The set was soon recalled, and Warner Bros. offered a toll-free number to replace the faulty discs for people who had already purchased the set. Due to popular demand, a corrected set was released and "Superman Ultimate Collector's Edition" returned to store shelves on May 29, 2007. On October 14, 2008, another Christopher Reeve Superman film