The King of your golf swing is a muscle that, it not working properly, can contribute to all 12 swing faults. Which muscle is it? The gluteals or otherwise known as the glutes. The power for your golf swing starts with the glutes, and most peoples glutes are not working properly. The perfect way to discover if your glutes are working properly in your golf swing is to have a Titleist Performance Institute (TPI) golf fitness assessment by a certified TPI instructor. Contact Cory Schidler, a certified Titleist Performance Institute golf fitness instructor and personal trainer in Scottsdale AZ. His phone number in 480-620-3000.