In addition to manipulating their minds, the Party also controls the bodies of its subjects. The Party constantly watches for any sign of disloyalty, to the point that, as Winston observes, even a tiny facial twitch could lead to an arrest. A person’s own nervous system becomes his greatest enemy. The Party forces its members to undergo mass morning exercises called the Physical Jerks, and then to work long, grueling days at government agencies, keeping people in a general state of exhaustion. Anyone who does manage to defy the Party is punished and “reeducated” through systematic and brutal torture. After being subjected to weeks of this intense treatment, Winston himself comes to the conclusion that nothing is more powerful than physical pain—no emotional loyalty or moral conviction can overcome it. By conditioning the minds of their victims with physical torture, the Party is able to control reality, convincing its subjects that 2 + 2 = 5.