Aerobic training is medium intensity, sustainable activity that uses your large muscle groups, is rhythmic in nature and burns fuel with oxygen in the body. Some examples of aerobic training include cardio machines, spinning, running, swimming, walking, hiking, dancing, cross country skiing, and kickboxing, walking briskly, running, riding a bicycle, pushing a lawnmower, swimming in the sun or dancing under the stars. Aerobic training refers to exercise that is sustained by available levels of free oxygen absorption in the body, or simply that the energy required is available through oxygen metabolism. You should be able to sustain aerobic training for longer durations than high intensity anaerobic sessions. Aerobic training becomes anaerobic when you are out of breath and energy is created by burning carbs in the absence absence of oxygen.