I was hoping you would say "unnaturally contorted in a desk chair for 8-10 hours per day"

Those numbers are off, and there's some studies showing that what people simplify to "chilling out" was also work, just done in groups back at the settlement. For example, preparing the animal you caught for eating, using the tools of the era, takes time. Unfortunately there are a lot of people understanding only the bare bones cliffnotes of historic life, then using it as fuel for their (justified but somewhat misinformed) campaign against the workload expected of us in modern life.

That said, the general take away is correct: humans used to be far more active in the completion of their daily duties.

Back when we lived to the ripe old age of 38.

(Im kidding, I know that was mostly due to infection and whatnot)