“The loads we experience in today’s world differ hugely from the loads people experienced a hundred, a thousand, and ten thousand years ago. Yet we blithely accept that our health issues—which so many of us share—are genetic. Genetic, a term we’ve internally defined as beyond our control. Whether out of convenience or ignorance, we have failed to address the habitat in which our genes dwell, and the impact of the way we move on the state of our health.”