These are not really "Rules" and not yet 500, but hopefully helpful principles I have used in teaching and practice over the 50+ years since I graduated from medical school.
Paul D. Thompson, MD is Chief of Cardiology-Emeritus at Hartford Hospital. He has authored over 500 articles & 3 books on exercise and cardiology. He qualified for the 1972 US Olympic Marathon Trials & finished 16th in the 1976 Boston Marathon.
The number of free subscribers for 500 Rules of Cardiology over time since it was added to the directory.