Golfers struggle hitting thin shots when the bottom of the swing (Spine) is behind the ball. This typically is the effect of golfers trying to keep their head down/and or their arms straight. When golfers are unathletic with an athletic motion required, off center shots occur. Players need to start with good posture. The ideal posture is one that a person can curl weights from. From this posture, make swings waist high to waist high allowing the arms to remain relaxed and the spine to pivot in the same direction that the clubhead is traveling. Do this and you will begin to find the bottom of the ball and strike the ball solid. Always remember that the toe of the club MUST get to the ball first before the heel of the club does to promote center face contact. As solid contact occurs, allow the motion of the swing to increase without tension in the arms.