My impression, perhaps misguided, is that (paleo) hunter-gatherers walked a lot, might have chased an animal hunting every day (but would not generally get completely tired), and perhaps played some sports. Once in a while they might have fought each other, which I imagine would be full-intensity. But that would be far from a daily, or even weekly occurence.
Is this idea correct? How often should you give a workout 10 out of 10 in effort? And if not very often, can additional maximum intensity workouts be justified as helping reduce the negative consequences of a sedentary lifestyle?
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It's damn near certain our HG ancestors didn't end the day with thoughts of going on a 10 mile run, whether for "fun" or "training." Nor is there reason to think they lifted and carried anything for the purpose of "getting stronger."
I use the 1-10 perceived exertion scale in exercise, though I make it a point not to go to "10" because that says "maximum limit