Jason Dunn, 31, has dystonia, a disorder that scrambles the signals his brain sends to his muscles so that his body twists into positions he cannot control, even while he sleeps. Ami Ankileweitz lives with spinal muscular atrophy, a condition that steadily wastes away the muscle tissue his nerves once controlled, yet he keeps working and describes his life in terms of what he can still do rather than what he has lost. The film follows both men through ordinary days, showing the specific, constant effort it takes to dress, move, or simply hold still, and sets their footage against interviews with muscle scientists who explain what is happening at the level of nerve signals and muscle fiber. Researchers walk through how a healthy muscular system works before showing where Dunn's and Ankileweitz's conditions break that system, and discuss the current state of treatment and research aimed at each disorder. The two case studies never merge into one story; they stay separate examples of how differently muscle disease can attack the same basic machinery.