I'm now 19 days post triple bypass, and, touch wood, all is going well. Since walking is the only exercise I can sensibly do at this stage, I'm out most days (fortunately the weather is good at the moment so its a real pleasure to be out and about). My question is 'how much exercise should I be doing'. I am currently walking a little over 2 miles at a decent clip (about 30 minutes). All of this on the flat. I feel good in myself and feel I could quite easily do more, but I have no yardstick with which to gauge what is enough and what is 'over doing it'. I don't have my first Cardio Rehab session until December so at the moment I'm making it up as I go along. Has anyone out there got any advice, guidance or experience they can share?