Hypoglycemia refers to a plasma glucose concentration lower than 2.8 mmol/L, at which point patients may exhibit signs of sympathetic nervous excitement, such as trembling hands, palpitations, pale complexion, profuse sweating, feelings of hunger, and fatigue. There can also be brain function disturbances, leading to symptoms like dizziness, blurred vision, hallucinations, and bizarre behavior. At this time, it is not advisable to exercise. Instead, immediate rest is recommended, along with the consumption of sugary foods to raise blood sugar levels. Exercise is strictly prohibited as it can lead to unnecessary physical injuries, such as falls.