SHR # 2406 :: How to Do Cardio to Lower Resting Heart Rate : Kristen Trombetta - Resting heart rate is an indicator of overall fitness and conditioning. Why is it that some people can do hours of cardio every week yet their resting heart rate doesn't get lower? Because HOW you structure your cardio plays a huge role on just how fit and conditioned you will become. And your resting heart rate is an ideal indicator. Here's the best way to effect it.