Why is it beat to have a resting heart rate below 70 beata per minute?

Your resting heart rate, when considered in the context of other markers, such as blood pressure and cholesterol, can help identify potential health problems as well as gauge your current heart health.“In certain cases, a lower resting heart rate can mean a higher degree of physical fitness, which is associated with reduced rates of cardiac events like heart attacks,” says Dr. Jason Wasfy, director of quality and analytics at Harvard-affiliated Massachusetts General Hospital Heart Center. “However, a high resting heart rate could be a sign of an increased risk of cardiac risk in some situations, as the more beats your heart has to take eventually takes a toll on its overall function.”In fact, research has found that a resting heart rate near the top of the 60 to 100 range can increase your risk for cardiovascular disease and even early death.

i don't know im sorry.