So our muscles do not require ATP. And there will be a build up of ATP in our cells. And that means the energy charge value will be high. Because if the energy charge value is high, that means ATP to amp ratio will be high. So what happens is these excess ATP molecules move on and bind onto the regulatory side of phosphor fructokinase and what they do is they essentially decrease the affinity of phosphorinas for the substrate molecule the fructose six phosphate. And so what happens is step three basically stops taking place.