Heart rates vary from person to person depending on age and fitness. A normal resting heart rate is generally considered to be 60-100 beats per minute, but can be as low as 40 beats per minute. A generalized resting heart rate for a 36 to 45 year old female with a good fitness level is 63 to 66 beats per minute. For a 36 to 45 year old female with a below average fitness level, the generalized resting heart rate is 79 to 84 beats per minute.
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