So in stage one, we trap that glucose inside the cell and we transform our low energy glucose into a high energy glucose. And then in Stage two, we use that unstable high energy glucose and we break it down into two molecules. And then we use those two molecules that we broke down in stage two in stage three and we use those molecules, we harvest the energy within those molecules and we produce the ATP molecules in stage three. So let's begin by looking at the details of stage one. So in Stage one, we take the glucose, we transport that glucose across the cell membrane into the cytoplasm of the cell. And then we use an enzyme known as Hexokinase to basically transform a glucose into glucose six phosphates.