Roller coasters are physically demanding experiences that are restricted for individuals with specific health conditions to prevent injury. Pregnant women are strictly prohibited from riding due to the risk of placental abruption from high G-forces and rapid jostling. People with heart conditions, high blood pressure, or a history of aneurysms are also restricted, as the adrenaline surge and shifting gravitational loads can trigger cardiac events or strokes. Those with chronic back or neck issues (like herniated discs) should avoid them to prevent further spinal trauma. Additionally, individuals who have recently undergone surgery or those with certain neurological conditions like epilepsy (due to strobe effects and intense motion) are often advised against riding. Finally, most rides have strict height and weight requirements; if a rider is too small or large for the safety restraint to lock securely, they cannot board. Always consult the warning signs at the entrance of each attraction, as they provide the most accurate medical exclusions for that specific ride.