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One of the most important aspects of any exercise routine geared toward improving cardio strength is to be sure you are exercising in such a way that you achieve and maintain your target heart rate. Maximum heart rate is calculated by subtracting your age in years from 220. Most people agree that a good target heart rate zone is 60 to 80 percent of your maximum heart rate. Because this factor is so critical to healthy, productive exercise, many treadmills come with a heart rate monitor built in, often in the handrails that you hold onto when using the machine. But you can also purchase an inexpensive heart rate monitor from most large department stores, health stores or at hundreds of locations online.