Obviously he really takes aim and makes efforts to make sure that everything is well prepared and ready to go. Choose your style, then, in any area of preparation. Els has lost some weight, figuring he will play better golf and have more endurance. John Daly has let himself regain weight he had lost because it's just too hard for him to watch his weight while giving up drinking. Montgomerie has gone up and down with his weight.
Some golfers run to stay in shape, others figure walking the courses is enough.
There are so many ways to prepare for a tournament, any tournament. And that is multiplied when it comes to majors, as players try anything and everything to prepare. They spend extra time with their teachers and sports psychologists, change their diets, visit the venues early, or maybe don't get in until Tuesday of tournament week so that they won't think about the championship too much in advance. But it's never clear what works, not, that is, until after the championship. Then we know what worked for at least one player.