Moving Too Close to the Ball
For those of you who are trying to get the contact from the top of the club down to the center of the club one of the possible reasons you might be hitting under the ball is because at some point during the swing you are actually moving in closer to the ball. This lowers the arc underneath the ball and causes you to hit it fat or pop it up with a wood club or catch the ball with the top of the blade.
Maintain Your Posture
What you would like to have happen is that the posture that you have at address you want to maintain throughout the swing. So however much you are bent over at address you want to be bent over the same amount on the backswing, the same amount at impact and the same amount on the first part of the follow-through.
A good drill to help you get that feeling is to enlist the aid of a friend to come in and just put their hand on your forehead while you are making swings so that you can feel that contact, thereby maintaining your posture while you swing. I asked Peter to help me and we are going to demonstrate this drill for you. That is how you can use a friend to help you get solid contact.