Pain in the chest after exercise is considered to be caused by respiratory muscle spasms, also known as forking. The main reason is that when the body’s strenuous activities, the skeletal muscles will consume the body’s huge nutrients and blood, which will lead to transient ischemia and hypoxia in the internal abdominal muscles, such as the stomach or the small intestine, and of course, including the diaphragm and intercostal muscles, which will lead to respiratory muscle spasms, and the patient will experience pain in the chest as well as pain in the rib margins bilaterally. So when the pain is obvious you should stop the activity and try to breathe in an abdominal position, you can massage with your hands the place where the pain is most obvious, or you can slowly tap the place where the pain is obvious to relieve the spasm of the respiratory muscles.