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The best tool to monitor these cahanges Is a heart rate monitor watch. Polar electro a finish company manufacture a wide range The more you exercise the fitter you get allowing your heart to pump more blood with every beat.  As a result your heart doesn’t have to beat as often to get the required oxygen to the muscles therefore decreasing resting heart rate and exercise heart rate on all exertion levels. The harder the training, the more fuel the muscles need and the harder the heart has to work to pump oxygen-rich blood to the muscles.