Hello all, I am about 1 1/2 years post surgery and generally feeling great. Also, for the record, I had aortic valve stenosis from birth and had my aortic valve replaced on May 4, 2016. Prior to my heart giving me troubles I was a pretty active runner, no races or anything just casual running, and would run about 15-20 miles a week. Before surgery I would always tend to push myself as hard as possible and enjoyed that feeling. My cardiologist has told me running shouldn't be any issue whatsoever, however, my family tends to worry more than I do about these kinds of things. My main question is should I worry about how high my heart rate gets when I'm running? I was out of commission for about a year prior to surgery due to it getting progressively harder and harder to continue running. I would greatly appreciate any advice anybody can give me, thanks.