Anaerobic exercise is a type of exercise that breaks down glucose in the body without using oxygen; anaerobic means "without oxygen".[1] In practical terms, this means that anaerobic exercise is more intense, but shorter in duration than aerobic exercise.[2]
The biochemistry of anaerobic exercise involves a process called glycolysis, in which glucose is converted to adenosine triphosphate (ATP), the primary source of energy for cellular reactions.[3]
This type of exercise does not lend to a buildup of lactic acid.[1] All-out Exercise does significantly increase blood lactate levels. For further review, see the Krebs Cycle. The mitochondrial process in the cell provides the energy required before the "oxygen debt" is initiated and the body moves into an aerobic process.
Anaerobic exercise may be used to help build endurance, muscle strength, and power.[4][5]