Interesting. The thinking behind my post was that if you add up training (for the activity they compete in) and all the other physical activities people do, th

Interesting. The thinking behind my post was that if you add up training (for the activity they compete in) and all the other physical activities people do, the differences in training volume will be dominated by the other differences -- consider people with jobs that involve manual labor, or, to a lesser extent, bike commuters. Perhaps this was controlled for in the studies? The other thing I had in mind was people whose sports involve lots of different movements one can practice -- say, ice hockey. I have no idea whether ice hockey shooting practice counts as high intensity... but it's not nothing, and doesn't seem much like ultra running either.