Cardio

How Do you chose your Cardio?  Here are some examples to help find something that you will stick to. if you are an outdoors person then Walking or Hiking, Biking, and/or Rollerblading. Now if you like going to the gym then you have a the treadmill, elliptical,  stationary bike and recumbent bike. As long as you work in your Target Heart Rate Zone you can to almost anything for Cardio.
What is your  Target Heart Rate Zone?  (click on link to find out your Target Heart Rate Zone)
Once you've gotten used to exercise (and are up to 30 minutes of continuous movement) you can start working on your intensity. How hard you work is a crucial factor in your workout because: interval training so that you work harder for shorter periods of time. this perceived exertion scale). The American College of Sports Medicine (ACSM) often recommends this level of intensity in its exercise guidelines. This is the level you typically want to shoot for during your workouts.
How hard you work is directly related to how many calories you burn

• Raising intensity is the best way to burn more calories when you're short on time.
• It's an easy part of your workout to change--all you do is work harder
• It's easy to monitor with a heart rate monitor or perceived exertion scale

So how hard should you work? That depends on several factors including your fitness level and your goals. There are three different levels of intensity you can focus on during your workouts, and you can even incorporate all of these levels into the same workout:

• High Intensity Cardio
• Moderate Intensity Cardio: This level falls between about 60-70% of your MHR (a level 4 to 6 on
• Low Intensity Cardio
: This type of exercise is considered to be below about 50-55% of your MHR, or about a level 3 to 5 on this perceived exertion scale. This is a good level to work at during your warm ups or when you're squeezing in other activities, like walking, throughout the day. : This falls between about 75-85% of your maximum heart rate (MHR) if you're using heart rate zones, or a 7 to 8 on this perceived exertion scale. What this translates to is exercise at a level that feels challenging and leaves you too breathless to talk much. If you're a beginner, you may want to work up to this level or try

Learn more about how to monitor your intensity and how much exercise you really need.
Keep in mind that your target heart rate calculation isn't 100% accurate so you might want to use a combination of perceived exertion and your heart rate to find a range that works for you.  For the full article you can go to http://exercise.about.com/cs/cardioworkouts/a/cardio101.htm 

I Recommend getting a Heart Rate Monitor. Polar is the best out there You can Find them at DICKS SPORTING GOODS Just click on the add it will take you straight to their website.