It is the same reasoning used by Art Devany in his excellent essay  
too  http://www.arthurdevany.com/webstuff/images/RevisedEssay.pdf


On 26 Jan 2007, at 15:13, [log in to unmask] wrote:

> Cynthia > If humans had to work hard physically to get their food,  
> perhaps we would not be so inclined to overeat.
>
> I really like this thought and agree with it wholeheartedly.  But I  
> believe that oftentimes we overestimate the amount of effort it  
> took to get food.  Remembering that men usually did the hunting and  
> women, old men, and children the gathering, hunting was not a daily  
> event generally.  It seems to me that hunters would target big  
> game, but that post olduwan tools it wasn't always extremely  
> difficult to find and kill that game.  But the combination of the  
> hunt and getting the meat back to camp would involve intense but  
> infrequent exercise, maybe two or three times a week.
>
> Gathering, on the other hand, involved repetitive and usually daily  
> activity.
>
> This is the reasoning I've used to justify my two to three times a  
> week of intense activity.  My workouts consist of an intense one  
> mile run followed by weight training two days a week and a 2 mile  
> run with no weights on the third day.  I always allow at least 48  
> hours between workouts.  Weekly time spent exercising for me is  
> less than two hours.
>
> Jim