Aerobic exercise refers to exercise that involves or improves oxygen consumption by the body. Aerobic means "with oxygen", and refers to the use of oxygen in the body's metabolic or energy-generating process. Aerobic exercises are generally your low to moderate intensity routines usually done to increase stamina and endurance. Jogging, finning, or playing basketball would all be good examples of Aerobic exercise or activity. Aerobic activity usually targets slow-twitch muscle fibers.