Hank walks through the first stage of cellular respiration, Glycolysis, which is the breaking down of glucose. This stage is different from the other stages in that it is an anaerobic process, so it does not require oxygen. This video also covers the inputs and outputs of Glycolysis.
Hank explains another stage of cellular respiration, The Krebs Cycle (also known as the Citric Acid Cycle). He notes that the purpose of this stage is to generate energy and uses several examples to convey how this process is necessary in our daily lives.