That's the flex. You can exist for decades without ever picking a single berry and hunting down wooly mammoths
The flex isn't that we exercise, it's that we exercise for the sole purpose of exercising. Most "natural" exercising is just used to get food/shelter/etc.
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...what? You don't do pushups or run around your home to pass up time/self-distraction? Huh, I thought that was the most common/normal thing ever.