Aerobic glycolysis can occur when oxygen and hydrogen atoms are bonded together to break down glucose. This will make sure that exchange in energy will occur. Anaerobic glycolysis is the process wherein glucose is also broken down, but this time, it has broken down without the need for any oxygen.
These two processes are needed to ensure that people will have enough energy to move around. It will be hard if people do not have enough power. They may not have the strength to do their tasks properly. This explains why people who have not eaten may not have the strength to do certain types of work.