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It doesn't feel right to imagine that 50,000 years ago, humans laboured hard in the natural environment.

Apart from walking to plants and water sources and running after animals, and play/fighting, what exercise-like work would have been done or needed on a daily or weekly basis?

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There is a middle ground between "labouring hard" and not doing anything remotely strenuous during your average week.

That's amplified by our new calorie dense diets that were not available before. We can argue all day long, facts are there, obesity rates are going up every year, lifestyle related cancer too, and that's just the tip of the iceberg.

Damn, most of my colleagues can't run 5km (without time restriction).

Food preparation and collection could be very labor intensive, i.e. digging out roots with improvised tools.

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