A normal human heart rate can range from 60 to 100 beats per minute (bpm) for adults at rest. However, athletes and individuals who are physically fit may have a resting heart rate below 60 bpm. A heart rate above 100 bpm at rest may indicate a condition called tachycardia, while a heart rate below 60 bpm may indicate bradycardia. It is important for individuals to monitor their heart rate and seek medical attention if they notice any irregularities or have concerns about their heart health.