Hello, it is not good for your health to exercise on an empty stomach at night. If you don't eat, you don't have enough energy. Under strenuous exercise, the body will be very weak. Our normal exercise needs energy to maintain, mainly from food. If we run on an empty stomach, the energy to maintain exercise can only be achieved by burning fat. This is one of the reasons why people often recommend losing weight through exercise. In addition, fasting exercise leads to a significant increase in free fatty acids in human blood. If there are too many free fatty acids, there will be "poisons" that damage the myocardium. This "poison" often leads to abnormal heart rhythm and even sudden death.

I hope I can help you, thank you!