I read somewhere that our jog is just as efficient as our walk. Clearly we've evolved to run long-distance. Still we can accumulate damage when doing it. Being

I read somewhere that our jog is just as efficient as our walk. Clearly we've evolved to run long-distance. Still we can accumulate damage when doing it. Being hardened against something doesn't mean it's risk-free. Example where the data are clear: We've evolved to resist carcinogens from smoke. But that only means we're less likely to die of smoke compared to other animals. It's still sensible to reduce exposure.