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Neither of those claims are true. Subsistence farmers work all day every day, and it's miserable work too. Hunter-gatherers have it a bit easier, 'only' working about as much as modern folk do, but make the trade for a whole host of stability and convenience issues. Pastoralists would probably be closest to your claim, but even then, you're looking at spending most of your day in the saddle. Does give a bit more context to the very "What the fuck, you WANT to live like this?" style reactions from pastoralist societies to sedentary farming societies though.

As for medical issues, you could look forward to a long life of parasitic infection and chronic health issues from past illnesses.