New Delhi, Dec. 22 -- A single number can quietly reveal how fit-or strained-your heart really is, and it isn't cholesterol or blood pressure. According to Dr Alok Chopra, your resting heart rate may be one of the simplest and most powerful indicators of heart health.

In a recent Instagram video shared on December 22, the senior cardiologist urged people to pay closer attention to their resting heart rate-the number of times the heart beats per minute when the body is completely at rest, such as while sitting calmly or lying down.

"For most people, a healthy resting heart rate ranges between 60 and 80 beats per minute," Dr Chopra explained. However, those who are physically fit or regularly exercise often record much lower numbers, some...