Aerobic activity improves your cardiovascular health and helps protect against heart disease. It also improves your physical energy and produces endorphins that improve your mood.
What you do and how often and hard you exercise are determined by your goals, present fitness level and health, interest, and convenience. It is important to choose an activity you enjoy and that fits your lifestyle and tailor it to your fitness level. This will help you make exercise a habit. It's also a good idea to choose more than one type of exercise to give your body a more complete workout and to avoid boredom.
If you want to increase aerobic benefits, try adding more vigorous activities and increasing the time.