Measuring your resting pulse rate is one of the best predictors of longevity. Men with a lower resting rate are much less likely to die of a heart attack and tend to be healthier in general.
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The best time to check your resting pulse rate is right before you get out of bed in the morning. The normal rate for an adult male is between 60 and 100 beats per minute. For an endurance athlete, the resting heart rate will typically be lower, indicating a more efficient heart function.