The more in shape you are, the slower the heart rate
can be and you can still be healthy as far as the heart
goes. Thelower heart rate
can also be a result of what you are doing; when you sleep, your heart rate can drop down into the 40's range with no ill effects. What IS importantant is whether or not your heart rate will increase with activity. If you are working hard, say running, and your heart rate will NOT go above the 100 range, it's time to visit your doctor.