Humans aren’t built to sit all day. Nor are we built for the kinds of repetitive, small movements that so much of today’s specialized work demands. Our bodies crave big, varied movements that originate at the core of our body. Imbalance comes when we spend all day doing small, repetitive actions like typing, scanning groceries, flipping burgers, or operating a computer mouse. Much of the purpose of structured training, therefore, is compensatory. It’s not so much that we need to learn to run per se, as we need to unlearn bad habits and correct imbalances wrought by the modern lifestyle.