This actually a good answer.The founder of the Maguire program talked about this in his book. And another speech program I attended (which did help my speech a lot) highlighted this as well. Pws tend to develop a faulty breathing pattern over the years by trying to force words out even when you're out of breath. Also there's the fact that it's common for pws to be incorrectly executing certain speech sounds. Not sure why that is but I've noticed this in my self and another close friend of mine who stutters also noticed this. But you only become aware of it unless you look up the correct tongue placement and shape of the jaw. So he's saying to retrain these aspects of speech. Both breathing habits during speech and practicing correct articulation of speech sounds.