Not me. Just started riding. Then again, no big health probs...good chloresterol levels, blood work, blood pressure, history, etc. and have regular annual exams. Was overweight in my own opinion (195 at 6'1"....but spent most of my life at 160) so went on diet to drop weight and increased my riding frequency which helps that a lot. Down 17 lbs so far with 25 total for goal. Very interesting thought, though.