The trait of well lubricated armpits under stress from other humans is likely related to combat somehow, directly or indirectly. Agriculture is too new an invention to account for such a well developed trait different than other animals. Tribal warfare has been with us much longer than agriculture. A primitive surprise attack massacre of a competing tribe would take many hours preparation and execution. If not in actual fighting, the tribes with superior weapon manipulation endurance were selected somehow.
Fair enough.
My comment was strictly about the notion of primitive combat lasting for hours on end. There is little or no evidence this was ever the case.
Running down and massacring the fleeing losers might consume quite a bit of time, but the actual combat was more likely measured in minutes instead of hours.