So the final product of stage three and Glycolysis is Pyruvate. Now notice in stage three, in step six we produce one NADH. In step seven and ten we produce one ATP each. And in step nine we produce a single H 20. Now this only shows one PGAL reacting, but in stage two we produce two. So that means stage three takes place twice and we form two nadhs, we form four ATPs and we form two H 20 molecules.