My friend is a highly qualified mountaineer who has climbed some of the world’s greatest rock and ice routes, including the famous north walls of the Eiger and Matterhorn. So does he teach his clients how to climb better by demonstrating specialized equipment, showing them how to pull themselves up with two fingers on steep walls of rock, or how to place ice axes into ice that’s only a quarter-inch thick? You would think so, but he actually spends the first few days teaching them how to walk! Most people assume they have the basics sorted out, but—in fact—they can’t even…