That's the thing, very few really understand, even some people that stutter doesn't fully understand because the levels of severity vary so much. Some people it's only an annoying inconvenience but to others it's severely debilitating in every way possible. The physical struggle as well as the mental struggle is the the part that can become problematic, I have lifted weights all my life practically but the hardest workouts have been trying to push words out of my mouth, the harder the push, the more the resistance.