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 (1978 film) by 3M that would reflect light back at many times the original intensity directly into a combined camera/projector. The result was a very clear and intense photographic reproduction of both the actors and the background plate, with far less image deterioration or lighting problems than occur with rear projection. A technique was developed that combined the front projection effect with specially designed zoom lenses. The illusion of movement was created by zooming in on Reeve while making the front projected image appear to recede. For scenes where Superman interacts with other people or objects while in flight, Reeve and actors