Not that anyone cares, but my cardiologist told me to do something along the lines of HIIT.
I was told to keep my pulse up at 70-80% for 20-30 mintues per day, everyday. Said studies keep coming out showing it's a lot better for the heart than the oldschool 60% aerobics...
At first it was a bit strange for me to keep my pulse up at 160 for 30 minutes, but I got used to it...