When Jean-Claude Killy made the French national ski team in the early 1960s, he was prepared to work harder than anyone else to be the best. At the crack of dawn he would run up the slopes with his skis on, an unbelievably grueling activity. In the evening he would lift weights, run sprints anything to get an edge. But the other team members were working as hard and long as he was. He realized instinctively that simply training harder would never be enough…