By following deep and ancient instincts to avoid the discomfort that comes with physical exertion, we increase the chances we will senesce faster and die younger, and we become more vulnerable to many diseases and chronic, disabling illnesses. We also miss out on the vigor, both physical and mental, that comes from being fit. To be sure, exercise is no magic pill that guarantees good health and a long life, and it is possible to live a reasonably long and healthy life without exercising. But thanks to our evolutionary history, lifelong physical activity dramatically increases the chances we
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