There have been documented cases of so-called “hysterical strength,” in which someone in the grips of intense stress is able to display extreme strength or fearlessness. Someone whose child is trapped under a car, for example, may find themselves temporarily able to lift the heavy vehicle in order to free their loved one. Though scientific understanding of hysterical strength is limited (as it’s not possible to recreate such life-or-death situations in laboratory environments), researchers suspect that extremely high levels of adrenaline and norepinephrine direct elevated levels of oxygen and blood to the muscles, allowing them to perform feats that would, under normal conditions, be impossible. However, a moderate adrenaline rush—such as one that occurs when riding a rollercoaster—will not result in superhuman strength.