The Twilight Zone Tower of Terror is designed to be a "psychological thrill" rather than a physically painful one, though it does produce intense sensations that some might find uncomfortable. The ride uses a specialized pulley system that pulls the elevator car down faster than the force of gravity (g≈9.8 m/s2), creating a feeling of "weightlessness" or "airtime." This can cause a "stomach-drop" sensation which, while not painful, can be jarring for those with sensitive equilibrium. For most riders, the physical experience is limited to a tickle in the chest and a firm push against the seat belt. However, individuals with chronic back or neck issues should exercise caution, as the rapid vertical oscillations—the "bouncing" effect—can put minor stress on the spine. Overall, the "pain" is almost entirely emotional and rooted in the anticipation of the drops.