the exercising part is definitely true. i always found when i let myself get super out of shape, fat and especially when i was eating lots of shitty food, my stuttering was worse. i started eating more fruits and vegetables and eliminated sweets and meat. my stuttering dramatically improved. can’t say this will help everyone because i know plenty of skinny stutters but for myself, and maybe others like me, it’s worth a shot. the exercise just makes sense scientifically.. the one thing they always teach in therapy is breathing techniques and control. so being so out of shape that you’re out of breath walking up stairs can’t be helping your stuttering. great advice man. not enough people talking about this.