I have done quite a bit of HRM training - and even more reading about it. But I have now got a HRM that gives me "loud" aural warnings about my heart rate and gives me a visual graph which I can analyse to my hearts content when I get back home. In a couple of weeks , I am going back to basics - to chisel my current fitness level into stone - regarding the 5 basic heart rate zones which all have a particular purpose to employ when training.
Heart rate training does require a bit of "brain work" -- it is not as simple as following something blindly . It reminds me of car GPS. -- so many people I know say that car GPS's are useless -- because ......... My answer to them is that the car GPS can only provide a suggestion to you - follow it blindly at your peril!! It does not take away to need to think ,understand and make personal decisions.