If you live in a hilly area like I do - walking is a good work-out. You don't have to kill yourself - just get your heart going and sweat a little. All this heart rate monitoring is nuts - IMHO. Just get out there and get some exercise everyday. I x-country ski in the winter.
Your point is well taken. I think monitoring my heart rate and max BP on a repeatable exercise might help to be a sort of motivator. I would know if I am making progress.
True, if I go for a brisk walk over the same course and do it faster without getting as tired, I know I am making progress too. Just can't put numbers on it.
Dave.