To manage the hassle of my travel better, I exercise a great deal, at my local health club, and in clubs in New York and Raleigh.  I have researched exercise almost as much as anything else, but there is still much to learn and a lot of general hokum around.

This section grew out of a couple of question marks in my mind: firstly how long and how hard should you exercise for?  And secondly,  how do you know the essential parameters of your heart so you can exercise most effectively?  The next pages contain the answers......