It is caused by blood deficiency in the body and insufficient blood supply in the viscera.
Solution:
Keep exercising every day and gradually increase the amount of exercise every day (for example, add a little speed today and tomorrow)
Follow your own feelings.
Essentials of fitness running (monkey summary);
Third, the running process should start at a slow speed, to ensure that the body is always warm and not to let the body catch cold.
Fourth, if you have abdominal pain during running, adjust your pace appropriately to deepen your breathing, and don't stop immediately.
Five, fitness running requires the whole body to relax, do not use hard hand movements, the chest is slightly open to the lungs, and the heel is as high as possible.
When you feel a little feverish, clear-headed and refreshed after exercise, you will experience the best state of exercise.