Here is one of the American young guns. It has been neat to see how this kid has developed since last year. He let his mouth get away from him a little last year, but he has learned to let his playing do the talking.
Kim has a great lower body action from the top of his backswing through to his finish. Watching the video below you can see a distinct bump of his hips before they start to turn through impact. The bump is important to get get your weight onto your left foot. It also helps get your club onto the right path down to your ball.
There are many players who either spin their hips too fast, or there is no weight transfer and they end up on their back foot after impact. If you do either of those watch Kim to get a good sense of a great hip action.