Speed tolerance refers to the ability to train the body to maintain high speeds for relatively long periods of time, and is commonly used in the training of middle- and long-distance runners. If vomiting occurs after speed endurance training, it is usually due to the body’s inability to tolerate the intensity of the exercise and insufficient oxygen supply to the body. Vomiting symptoms can usually be relieved after rest. Avoid pursuing high-intensity exercise, and pay attention to gradual progression, so that the body can gradually adapt to the corresponding exercise intensity. If you don’t vomit after the usual speed endurance training, and this happens only occasionally, you should consider whether it is caused by fasting or overfeeding before exercise. Exercise in a fasting state may cause a hypoglycemic reaction, at which time the body’s sympathetic nervous system is overexcited, and adrenaline secretion is excessive, which can lead to nausea and vomiting. When hypoglycemic reaction occurs, carbohydrates should be replenished in time, such as eating sugar, chocolate and so on. In addition, exercising in an oversaturated or cold state is more likely to stimulate the gastrointestinal tract, which then causes nausea, vomiting, abdominal pain and other uncomfortable symptoms. Symptoms can be relieved after rest. Before exercise, it is recommended to do a good job of warming up, eat in moderation, and keep warm when the weather is cold.