There are many reasons for feeling nauseous after fitness, which may be due to excessive exercise, the body can not adapt to strenuous exercise, and insufficient oxygen supply, leading to nausea and vomiting. It is suggested that the exercise should be gradual, and don't do too much exercise at once. In addition, if you lack exercise at ordinary times, you will also have symptoms of nausea and vomiting after sudden exercise.

In addition, during strenuous exercise, the heart, lungs and muscles need a lot of blood, and the body will divert blood from unimportant physical processes to support the increased demand of muscles, lungs and heart. Reduced blood flow into the stomach and intestines will slow down the movement of the intestines, leading to discomfort or nausea.