We have stage one, stage Two and stage three. Now, in stage one, we actually use energy. So the entire purpose of stage one is to prepare the glucose molecule for a breakdown. 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.