weightlifting and 90 minutes on the trampoline. He added of muscle to his "thin" frame. He later made even higher gains for Superman III (1983), though for Superman IV: The Quest for Peace (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 Superman IV 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 difference stylistically between Clark and Superman. Otherwise, you just have a pair of glasses standing in for a character." On the commentary track for the director's edition of Superman II: The Richard Donner Cut, creative consultant Tom Mankiewicz spoke of how Reeve had talked to him about playing Superman and then playing Clark Kent. Mankiewicz then corrected Reeve, telling him he was "always, always playing Superman" and when he was Clark Kent, he was "playing Superman who was playing Clark Kent." Mankiewicz described it to Reeve as a role within a role. The film, made without the use of computers for special effects, was the first attempt to realistically show a person flying. Roy Field, the film's optical supervisor, said, "There were many techniques used to make Superman fly, but the best special effect of all was Christopher Reeve himself. We discovered very early on he, being a glider pilot, could hold his body aerodynamically. So when he got into the harness, the whole shot began to come alive." The film grossed $300.2 million worldwide (unadjusted for inflation). Reeve received positive reviews for his performance: "Christopher Reeve's entire performance is a delight. Ridiculously good-looking, with a face as sharp and strong as an ax blade, his bumbling, fumbling Clark Kent and omnipotent Superman are simply two styles of gallantry and innocence." – Newsweek "Christopher Reeve has become an instant international star on the basis of his first major movie role, of Clark Kent/Superman. Film reviewers—regardless of their opinion of the film—have been almost unanimous in their praise of Reeve's dual portrayal. He is utterly convincing as he switches back and forth between personae." – Starlog For his performance, Reeve won a BAFTA Award for Most Promising Newcomer to Leading Film Roles. Reeve