The following reasons are common for leg training and vomiting: First, the process of leg training will produce a large amount of acidic metabolites, lactic acid in the leg muscles will pass through the blood circulation and enter the inner cranial cavity to stimulate the central nervous system, which can also stimulate the digestive system, and the patient may have clinical symptoms of wanting to vomit. Secondly, during the process of leg training, the patient will experience severe leg muscle pain, even unable to bear weight and walk, and there will be obvious pain in moving the leg, and the pain stimulation is a negative stimulation that will affect the function of the central nervous system, and the patient may also experience clinical symptoms of wanting to vomit. If you want to vomit, you must deal with it in time, you can drink a lot of water or intravenous fluids to reduce the adverse stimulation, so that the acidic metabolites are excreted as soon as possible, which can alleviate the clinical manifestations of wanting to vomit, the patient should control the exercise intensity during the process of practicing legs to avoid excessive intensity to produce the corresponding adverse reactions.