Your body will be able to perform its vital tasks easier. Increase in the number of capillaries. You can transfer more oxygen to the body's muscles. The capillaries are also where the body exchanges nutrients and toxins, hence, another boost for your immune system. Decreases the stores of fat in the body.
Aerobic exercise burns more fat faster than any other activity.
Many are surprised that you get the best fat burn is at moderate levels of aerobic intensity. After 20 to 30 minutes the body starts drawing fuel from the fat. I personally recommend 45 minutes of continuous moderately intensive activity when your goal is excess weight loss. Don't think Intensity, think Duration and Moderation. The body burns calories more efficiently.