My resting has been 36-40 since age 15.  Scared the hell out of me once when I was in an ER for trauma and they say &quot;we have to fix your heart first&quot;.  It&#x27;s common for athletes to have a resting heart rate below 40, though I&#x27;m not aware of any relationship between performance (e.g., VO2max) and resting heart rate.  I.e., 35 is no better or worse than 50.