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ATP
Among all the high-energy molecules that the body uses, ATP (Adenosine Triphosphate) is the most common and acts as the body's primary source of energy. Found in almost every part of the body, ATP can be used to build other molecules to power any cell activity. All living organisms, including plants and single-celled animals, use ATP to power cells.
GTP
GTP (guanosine triphosphate) helps process and activate fatty acids so it can be used by the body; it's also mainly used to complete the strands of ribonucleic acids by creating guanylic acids, a crucial substance needed to make RNA. GTP can also be easily converted by a cell to become an ATP if needed.
Glycogen
Glycogen primarily comes from carbohydrates. Unlike ATP and GTP, glycogen is mainly stored in the liver and muscle tissues. When food containing carbohydrates enters the body, the blood sugar level rises, thus triggering the pancreas to produce insulin. Insulin triggers production of several enzymes in the body, including glycogen. Once glycogen is produced, the liver and muscles store it as a reserved energy molecule to be spent when glucose levels in the blood turn low. Glycogen is usually spent during extraneous physical activities.
Triacylglycerols
Triacylglycerols, a combination of glycerol and three other fatty acids, serves as a set of backup energy storage molecules much like glycogens. Triacylglycerols are mainly stored in fat cells. Migratory birds are the best examples on how these high-energy molecules are used. During migration, birds do not consume any food and instead use up triacylglycerols to replenish energy.