Aerobic exercise is a physical activity that may be somewhat associated with anaerobic exercise. Aerobic exercises, in particular, use oxygen to permit the muscles to produce energy and describe all types of physical activity, but are generally limited to those that are performed at energy levels that may be identified as being intermediate and continuously performed for sustained lengths of time.

Aerobic exercise works to maintain a higher heart rate while employing oxygen to consume fat and glucose in the production of adenosine triphosphate, or ATP, which is the transporter of vital energy for every cell in the body. At the beginning of aerobic exercise, glycogen becomes broken down in order to produce glucose but, if there is no glucose available, this culminates in the switch to burning fat. The attempted decomposition of fat is a metabolic process which requires time and thus causes functional levels to taper off while waiting for additional energy input. When the body starts consuming fat as a fuel, it passes into the state that marathon runners have termed, "hitting the wall."

There are a variety of common types of aerobic exercises and the standard ones are performed at levels of intensity that would be deemed as high and maintained for longer time periods. In the example of an athlete running a long distance at a moderate pace, this is treated as being akin to an aerobic exercise, while rapid sprints are not considered to be aerobic training. Indeed, any physical activity that entails continuous motion can be termed as aerobic exercise, though activities that have frequent breaks are not considered to be aerobic exercises.

An often-voiced criticism of aerobics is that it is not sufficient for professional standards, such as those set for athletes, combatants, and emergency personnel. This may be because aerobic exercises do not provide muscular strength, particularly in the upper body musculature.

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