Something to keep in mind with regards to activity levels is that
virtually every skeleton found from pre-agricultural eras exhibits the
muscle attachments on par with those of olympic athletes.  Our ancestors
WERE very active (check out Loren Cordains paper on the projected energy
expenditure of HG's).  Your point that our ancestors were likely excellent
organizers and not simply pushing boulders about for the heck of it is most
certianly true, however this does not diminish the amounts and intensities
of of activities they performed.  In Another aspect of the paleo life-way is
the enormous amounts of rest which HG's had.  essentially very hard work and
LOTS of rest. Most modern periodized training for elite athletes follows
patterns similar to this.
Robert

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