2)
Improve your posture. The posture is straighter and more symmetrical, with standing and sitting.
3)
Improve your mentality and demeanor. More determined, more focused, optimistic, full of energy, more confident in dealing with people.
4)
Improve your figure. Reduce fat, gain muscle, slim, symmetrical, strong and sturdy.
In short, aerobics makes people more fit from the inside out.