strenuous joggers - people who ran faster than 7 mph for more than four hours a week; or who ran faster than 7 mph for more than 2.5 hours a week with a frequency of more than three times a week -
Since when is this the definition of "strenuous"?
Malmo, 7mph for an out of shape couch potato is strenuous. You probably do not go to many 'races' (fun runs really) these days but most of the participants fit this description.[/quote]
I assume Malmo's point is that "strenuous" would naturally be a function of the age, gender, and fitness level of the individual. I've only seen the abstract of the subject paper which doesn't define the criteria they used for "strenuous", but an arbitrary pace seems like a poor choice.