The resting heart rate is defined as the heart rate when a person is awake and at complete rest. Well-conditioned endurance athletes typically have lower resting heart rates (e.g. 30 - 50 bpm) than unathletic people (e.g. 50 - 90 bpm).
Measuring resting heart rate each day as part of a morning ritual is recommended for athletes. Increases in resting heart rate can indicate stress and overtraining.