Sure, here’s the revised translation with your additional details: You’re absolutely right. When singing occurs, a very complex neurological process takes place, which essentially comes down to the fact that the airflow is always smoothly pressed against the vocal cords, and the diaphragm thus always moves fluidly. So actually, the respiratory muscles, the intercostal muscles, the abdominal muscles, and the diaphragm, which is completely relaxed at that point, are recruited in such a way. It’s about the coordination of those muscles, which ensures that the diaphragm muscle always moves smoothly, never tenses, and remains fluid. Essentially, you need to learn how to use the respiratory muscle coordination from singing when speaking. This can be achieved through specific exercises based on this principle. It involves training the muscles between the ribs, and these exercises make the ribcage more flexible, particularly the muscles at the bottom of the ribcage, which often remain tense due to years of stuttering and have simply forgotten how to move properly and smoothly. As a result, because the diaphragm muscle is attached to the 7th to 10th ribs, it doesn’t have the space to flatten properly. The important thing to understand is that muscles attached to the skeleton, like skeletal muscles, can be trained and voluntarily controlled because they are composed of striated muscle tissue, which is subject to your will. This is different from smooth muscles, like your heart, which you cannot control, but you can control your breathing. That’s an important distinction. This also means that you can train these muscles, make them stronger, and make them more flexible. The same applies to the human ears. The ears are also surrounded by muscles that you don’t typically use, but you can train to use them because you can move your ears. You can develop this ability, but the most important thing here is that you can see your ears. By looking in the mirror, you can see your ears and train yourself to make that movement. The tricky thing about the diaphragm is that you can’t see it. However, you can still learn to voluntarily control the diaphragm because you can observe the movement of the ribs. Anyway, that’s a technical detail, but it’s important to understand. In the end it comes down to this. You get the full control of the diaphragm (like you sing) and this will give you the ability so speak without stuttering. By keep applying the method of DF you retrain your diaphragm to move up fluently and after (months - it takes a long time) your diaphragm gets used to not stutter anymore. Another important aspect is that you also learn to begin speaking at the right moment. Research, which I will include in the appendix, shows that people who stutter often speak at inappropriate lung volumes—either with very little air in their lungs or with too much air. This disrupts the entire coordination of their speech. This is something that you also train: you learn to start speaking at the correct moment. This is essential, as it forms the foundation for smoother speech. For instance, if you exhale completely and there is no air left in your lungs, but you still try to speak, you’ll be speaking without sufficient air. This not only impacts the vibration of your vocal cords but also disrupts the flow. The air pressure wants to move upwards, but it can’t, which causes irregularities. So, this timing is also part of the training. Appendix: [https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1440-1843.1999.00178.x](https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1440-1843.1999.00178.x)