Widely regarded as one of the greatest golfers in the history of the sport, Hogan is especially known for his mastery of the golf swing. At the start of his career, he played with a hook that threatened to ruin his game, until he dedicated himself to correcting it—and in doing so, he gained a rare and hard-fought understanding of the fundamentals. Curious fans itched for clues about his legendary technique, dubbed “the secret,” that allowed him to persevere and even return to the height of his powers after a car crash that shattered his body and almost took his…