The best way to start is always with the fundamentals. Justin Rose has impeccable fundamentals. There are so many swing faults that are actually caused by poor fundamentals. I know it is boring…but…more players should spend more time working on their grip, stance, posture and alignment. There are many swing faults that almost disappear because a player starts using proper fundamentals. Jack Nicklaus always said that he would play for three weeks and then spend a whole practice session working only on his fundamentals. To me…that gives the basics a lot of importance. You can tell Justin Rose has heeded that advice.
Now look at his stance and posture. Look how tall he stands into the ball. That is key. You don’t have to be tall, although he is listed at 6’3″, and you can see how he uses all of that height in his stance. When players stand small into the ball they end up with a rounded back and knees that are bent too much. This leads to two problems…an inconsistent swing and possible injury as it is harder on your body.