Rib breathing or you can call it costal breathing or Diaphragmatic breathing is very popular and you can search for it on the internet. I am passing on to you what I learned in the stutter control boot camp ​ **The diaphragm:** The diaphragm muscle is one of the largest muscles in the body and the largest semi-automatic muscle in the body, meaning it works largely like your eyelashes - part of its function is not under conscious control, and part is. Just watch what it does the next time someone unexpectedly screams at you. Your arms fly up to cover your face, chest, or thighs. What do your muscles do? They contract and prepare for protection, or fighting, or fleeing, and of course, you also inhale sharply. Now why do you assume that you will inhale sharply? Well, because the diaphragm is a muscle. Like all muscles, it tends to contract in response to fear. Unfortunately, the diaphragm needs to relax in order to speak. You have two powerful forces trying to move the diaphragm in opposite directions. You have the natural fear response causing the diaphragm to contract and pull in air. Then you have your desire to speak, trying to relax the diaphragm so that air can move over the vocal cords. And the result? The diaphragm freezes, of course. If we now assume that the diaphragm is the physical center of our emotions, it becomes more than just an ordinary muscle that interacts with fear through contraction. It's the muscle where you feel the emotion of fear. Add to that the fact that we can't see the diaphragm's action, and we begin to see; why stuttering carries all this mystery? **The main structures of the diaphragm “The abdominal and thoracic diaphragm”:** The diaphragm is referred to as a large muscle that controls breathing by controlling the space in the chest cavity. In terms of controlling the central tendon of the diaphragm, this is controlled by two separate sets of muscles: the costal and muscular diaphragm. These two parts can work independently of each other to the point that some diaphragm experts refer to them, as we will do in this course, as the "costal diaphragm" and the "muscular diaphragm," although they are officially part of the same structure. The cartilaginous part of the diaphragm (the costal diaphragm) is structurally linked to the spine. When it contracts, it pushes your abdomen down to make room for the space in the chest to capture air. This happens when your abdomen moves in and out when you breathe. If your chest moves up and down, it is a secondary result of abdominal displacement. The diaphragm is responsible for 98% of your breathing. It works even when you are asleep and when your body doesn't need a lot of air. So it mostly works automatically. Most people speak from the air produced by the diaphragm. The costal part of the diaphragm, or the "costal diaphragm," is much larger and more substantial than the cartilaginous part attached to the lower ribs. When the costal diaphragm contracts, it pulls the chest cage outward and expands the chest to create space. Whether the costal diaphragm plays a role in pulling the ribs upward and outward is unknown, but you do know that the costal diaphragm is used when expanding the ribs, when you yawn, when your body demands more oxygen, and during heavy exercise, coughing, and sneezing. It is also used sometimes when you scream or sing loudly, usually voluntarily - you can control when to use it or not to use it.