The cause of the bruit is pain caused by spasm of the respiratory muscles, including the intercostal muscles as well as the diaphragm. The main reason is not warming up effectively before the activity, because the skeletal muscles need a lot of blood and nutrients to move, so it will lead to a temporary supply of blood to the respiratory muscles, or less nutrients, so it will cause the spasm of the respiratory muscles, after the spasm will lead to bilateral pain under the ribs and even the abdomen. The pain should be immediately rested, slow breathing, try to use abdominal breathing, so that the pain will be better. The pain can be gently massaged with the hands in the more obvious areas, or the respiratory muscles can be gently tapped with the hands to try to get effective relief from the spasm. Also, you can raise your hands up and do stretching exercises on the left and right side, which will also play a role in pain relief.