>The problem is not a physical problem (a problem of the tongue, mouth or jaw), but rather a psychological problem Thank you, but I am afraid that you completely misunderstand me. You argue that a speech block could occur when the diaphragm has contractions. I agree with you on this statement, and in academic literature this phenomenon is called: "Halting the movement of respiratory and laryngual muscles". I suggest to read research on this. So, you are correct, but it's the 'speech muscles' that prevents breathing out which are the respiratory and laryngual muscles. **Question**: Does it make more sense now? Your next statement is: "***The problem is not physical***". I agree with you, because the problem that the movement of our speech muscles halt (which as you correctly pointed out, causes breathing issues), is not from a physical issue, but rather a psychological issue (or academic literature calls this phenomenon 'neuro-physiological' issue but it comes down to the same point as what you are referring to). In short, you are correct that 'fear' of difficult letters lead to halting the movement of 'speech muscles' that normally contracts the diaphragm (which are 'laryngual' and 'respiratory' muscles). Additionally, it's not just 'fear' that maintains the vicious circle of paralyzing these speech muscles, rather it is: * fear (as you correctly pointed out) * anticipation of stuttering * anticipation of negative listener's responses * unhelpful attitude to perceive stuttering as a problem and to be avoided * unhelpful condition to prioritize feedback over forward flow * unhelpful behavior of excessively reinforcing overreliance on secondary characteristics, corrections, intrusive thoughts and feelings (yes indeed, like 'fear' of feared letters), sensory feedback, etc * etc Your next statement is: "***Relaxing the diaphragm is one of the most important things that stop stuttering***". I agree with you, diaphragm techniques like the one you suggest or other diaphragm techniques like DF-method, lead to stop stuttering. However, the way that this phenomenon works is not from a breathing standpoint, the reason that it leads to not blocking is because of a 'distraction' standpoint that focuses on 'breathing' or visualizing the diaphragm which leads to sending command signals to move speech muscles, whereas PWS normally are disrupted by focusing on 'fear', triggers, reactions, unhelpful corrections, secondary characteristics and feedback that then disrupt us from sending command signals. **Question**: Does it make more sense now? In conclusion, there are many of these kinds of therapies in many countries and when using it, it leads to not stuttering. Unfortunately, research has yet to get objective results with this strategy to outgrow stuttering. **Question**: What do you have to do in your opinion, in order to outgrow stuttering (with this or another strategy)?