Aerobic exercise is a physical activity that may be closely connected with anaerobic exercise. Aerobic exercises, specifically, utilize oxygen to permit the muscles to generate energy and describe all forms of physical activity, but refer mainly to those which are performed at energy levels that may be identified as being moderately elevated and continuously performed for extended periods of time.

Aerobic exercise seeks to establish a higher heart rate while using oxygen to consume fat and glucose in the generation of adenosine triphosphate, or ATP, which is the transporter of essential energy for each and every cell. At the initial step of aerobic exercise, glycogen is decomposed in order to produce glucose but, if there is no glucose present, this culminates in fat beginning to decompose. This decomposition of fat is a process which requires time and thus causes functional levels to go down while awaiting more energy. As the body starts using fat as a fuel, it passes into the state that marathon runners have termed, "hitting the wall."

There are a variety of different forms of aerobic exercises and the classical ones are done at levels of intensity that may be deemed as fairly high and maintained for longer time periods. In the instance of a person running several miles at a modest rate, this is treated as being similar to an aerobic exercise, while rapid sprints are not considered to be aerobic training. Indeed, any physical activity that involves recurrent motion may be termed as aerobic exercise, although activities that have frequent breaks are not thought of being as aerobic exercises.

An often-voiced criticism of aerobics is that it is not sufficient for professional benchmarks, such as those of athletes, military, and police and fire personnel. This is said because aerobic exercises do not provide muscular strength, especially in the upper body musculature.

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