Energy is produced in the body in a number of different cycles, these include the Kreb’s cycle and the electron transport chain. These cycles rely heavily upon having a overabundance of vitamins, hormones and methylation substances on hand to complete their work. When these materials are used up or not available, then fatigue, tiredness and lethargy sets in. Ultimately, all energy is converted into a molecule called Adenosine Triphosphate, or ATP - this substance is literally the spark of life that every movement and thought we make fires on.

Adenosine 5'-triphosphate (ATP) is a multifunctional nucleotide primarily known in biochemistry as the "molecular currency" of intracellular energy transfer. In this role ATP transports chemical energy within cells. (Source Wikipedia)

Adenosine triphosphate (ATP) is the biochemical way to store and use energy.The entire reaction that turns ATP into energy is a complicated process, but here is a summary:

• Chemically, ATP is an adenine nucleotide bound to three phosphates.
• There is a lot of energy stored in the bond between the second and third phosphate groups that can be used to fuel chemical reactions.

When a cell needs energy, it breaks this bond to form adenosine diphosphate (ADP) and a free phosphate molecule.

• In some instances, the second phosphate group can also be broken to form adenosine monophosphate (AMP).
• When the cell has excess energy, it stores this energy by forming ATP from ADP and phosphate.
  

ATP is required for the biochemical reactions involved in any muscle contraction. As the work of the muscle increases, more and more ATP gets consumed and must be replaced in order for the muscle to keep moving.

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