Very similar experiences. I worked 1-1 with children with trauma and had noticeable blocks constantly. But whenever I took them hiking and was out of breath, I got perfectly fluent. Are you also more fluent when speaking angrily? Is saying your name/name of school/pet/town/address to someone else very difficult too? I studied and used ideas from 2 highly trained SLPs who also are/were stutterers, and have nearly eliminated my silent blocks for almost 2 years. valsalva stuttering - William parry Tim Mackesey - look at his free podcast, and start at ep 1 Please feel free to ask me other questions or DM