Resting heart rate (RHR) is one of the simplest yet most powerful indicators of cardiovascular health. This topic explores what RHR means, how it reflects heart efficiency, and why lower rates often indicate better cardiac fitness. It will explain normal ranges across age groups and when deviations may signal concern. The article will also highlight how an ECG (electrocardiogram) provides a precise measurement of heart rhythm and electrical activity beyond just beats per minute. Readers will understand when an ECG is recommended to evaluate abnormal resting heart rates.