Hi OP! SLP student here. I am super skeptical of this technique. It seems more grounded in the realm of voice disorders than stuttering. I can pretty safely say there is no evidence supporting this therapy option and I would approach it with caution! Biomechanically, this is what is happening in this technique: * you are squeezing your vocal folds really tightly together when you 'tense up'. * When you speak with tensed vocal folds, you're forcing air more forcefully through them, which gives your speech that real hard, sharp onset sound ('hard glottal attack'). This concept is more commonly used for people who can't close their vocal folds together properly for whatever reason (cyst, muscle weakness etc). There is NO biomechanic or physical problem in stuttering behaviours, so this technique isn't really appropriate.... Last word of caution - this 'tensing up' also causes your vocal folds to snap together pretty forcefully. Think of clapping your hands for a long time, and really forcefully. Your hands get sore, as will your vocal folds. This may lead to other unwanted problems (vocal nodules). That said, if you want to try it - go for it! What works for one person may not work for another. Hope you find something that works for you! :)