Final answer:
A sinus rhythm at a rate of 60-72 is considered normal and healthy.
Step-by-step explanation:
A sinus rhythm at a rate of 60-72 is considered normal and healthy. The normal resting heart rate for an adult is in the range of 60-100 beats per minute. A heart rate below 60 bpm is called bradycardia, and a heart rate above 100 bpm is called tachycardia. Trained athletes may have lower heart rates, but for most individuals, rates lower than 50 bpm would indicate bradycardia.