“Muscle glycogen phosphorylase deficiency (glycogenosis type V or McArdle’s disease) is a disorder characterized by marked exercise intolerance—that is, premature fatigue and cramps during exertion, with frequent episodes of rhabdomyolysis.” “Unfortunately, sedentary behavior may worsen exercise intolerance by further reducing the limited oxidative capacity caused by blocked glycogenolysis.” [7] Glycogen matters. Having chronic full glycogen…