Aerobic exercise is a physical activity that is closely connected with anaerobic exercise. Aerobic exercises, in particular, use oxygen to permit the muscles to generate energy and describe all types of physical activity, but are usually limited to those that are performed at levels of intensity that may be identified as being moderate and continuously performed for extended periods of time.

Aerobic exercise works to maintain a higher heart rate while using oxygen to consume fat and glucose in the production of adenosine triphosphate, or ATP, which is the transporter of basic energy for each and every cell. At the initial step of aerobic exercise, glycogen becomes broken down in order to produce glucose but, if there is no glucose present, this culminates in fat beginning to decompose. This attempted decomposition of fat is a process which takes time and thus causes performance levels to go down while awaiting additional energy input. When the body starts using fat as a fuel, it goes into the state that marathon runners have termed, "hitting the wall."

There are a number of different forms of aerobic exercises and the standard ones are performed at levels of intensity that may be deemed as high and maintained for longer time periods. In the case of a person running several miles at a moderate pace, this is treated as being similar to an aerobic exercise, while rapid sprints are not considered to be aerobic training. Actually, any physical activity that involves recurrent motion can be termed as aerobic exercise, though 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 requirements, such as those of athletes, military, and emergency personnel. This may be because aerobic exercises do not provide muscular strength, especially in the upper body.

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