There’s currently no clinical consensus that exercise worsens stuttering. Only limited anecdotal reports and a few small studies suggest that some individuals might experience temporary increases in dysfluency after intense exertion. While elevated dopamine levels have been observed in people who stutter, this reflects correlation rather than a proven causal mechanism. I know you mean well, and based on your post history it’s clear your intentions are good. But you should understand that presenting ideas as absolutes can affect how people interpret them. Folks on the internet can be very impressionable, and you have noticeable influence in this community—so I just want to remind you to be careful with how things are phrased.