Humans did not evolve to be inactive

Humans evolved to do
a variety of activities,
from low to high intensity.
Most of the time, early
people were resting or
walking long distances,
but sometimes they
had to run or sprint,
climb trees, and throw
things. So a degree of
high-intensity ability was
important in terms of
natural selection. What
we did not evolve to be
is inactive.

Daniel Lieberman,
professor of human
biology at Harvard
University

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