When a golfer starts hitting the ground behind the ball instead of the ball itself he is doing what is called "hitting fat." It is an infuriating habit to fall into, easy on the ball but awfully hard on the score and the ego. Fortunately, it is an ailment that can be cured easily. The problem is usually nothing more than a head that is changing its plane during the swing and thus changing the plane of the swing itself. This happens two different ways. You may be dipping your head just before impact, thus lowering the level of the swing. Younger golfers are prone to do this. Or you may be allowing your head to sway to the right during the back-swing. This shifts the plane of the swing to the right. The cure, obviously, is to keep a steady head throughout the swing. If hitting fat is a mistake you frequently make, try some practice shots while a friend watches to see if your head is dipping or swaying. If it is dipping, just stop it, primarily by concentrating on holding firm. If it is swaying, you can help yourself by pushing down hard against the inside of the right foot during the backswing, thus thwarting any tendency to shift the head to the right.