I am abosulutely convinced that the more fit one is going into surgery, the better the chance for a good outcome and speedy recovery. I was 53 when I went in for my AVR, and was riding my bike right up until my surgery despite having a weak leg due to a herniated lumbar disc. I did what I could because it was important to me to be as fit as possible going into surgery and I was indeed walking on day 1 and out of the hospital in 3 days. My surgeon and cardiologist said my fitness level had everything to do with my quick recovery. I consider it a true blessing that I could and can still work out at a high fitness level and encourage anyone else who can to do so. The benefits are many!