My golf habit works out to quite a bit more walking than 19 daily minutes.   And I don't really care what 'the average North American' does.  I choose my exercises, not Desser and Dannenberg.  

It isn't a topic I would 'read in a bus going to work' because I am retired.  When I was forced to ride a bus when I was employed several years ago in Salem, reading was often interrupted by the 'ambiance' issues I mentioned above, so I find that overrated.  

Keep trying; we may find common ground, but I doubt it.