Circulatory system: Thirty minutes of raising your heart rate and getting your circulatory system all hot and bothered. Check this little clip out.
I started out just walking, and then picked up the pace. This little activity once a week will make all the difference in your health. You can definitely add to it and pick up more than once a week if you are conditioned to more work.There are also some great programs available to help you get in better shape.
Just remember balance is key.