That&#x27;s a good point. I&#x27;d treat it like BMI. It&#x27;s a good guideline, but it&#x27;s a heuristic and won&#x27;t fit everyone. In this case, if you&#x27;ve been a longtime runner, you&#x27;ll almost certainly have a healthier heart than your age-wise peers (not guaranteed, but as a general rule).