[Reelin]

> and whether those are ideal for longevity and quality of life in modern society

This seems like the real question to me; I assume pre-agrarian humans were biologically optimizing to survive famine. Not being an expert on the subject, I wonder what sort of tradeoffs are associated with intense exercise regimes (and how the balance ultimately comes out with respect to modern society).

[shajznnckfke]

I suppose the low fat / high muscle combination would be unlikely for much of the year in places where it was necessary to store fat for the winter.