He Allegedly Used His Gym Membership After Hours.
Arnold appears to have a talent for evading detection in public places. He was said to have a reputation for going to the gym late at night as part of his bodybuilding regimen. Arnold Schwarzenegger realized after moving to the United States that he had more ground to make up in the field than any of his contemporaries.
Working longer hours than anyone else at work was the only way he could beat the competition and achieve his goals, so for him, success meant working longer hours than anyone else. When the gym closed at the end of the day, it appears that he did some additional workouts to maintain his muscular bulk. It wasn’t an issue for Arnold because he had a long history of success in bodybuilding competitions.