stonger than olympic rowers and other athletes according to studies discussed in the radio 4 prog Inside Science. This was less in the Iron Age, when different styles of quern/ metals etc... were developed. According to the prog, Studies of indigeonus peoples using saddle querns found it took 5 hours of graft to make the daily requirement of flour. Wow, that's a lot longer than I was expecting.
If you're interested it's in the first little snipet/subject of the broadcast (though one of the later topics about new genetic code for protiens in bacteria was a bit scarey).
http://www.bbc.co.uk/programmes/b09gbnfx#play
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