The Swing Trainer Cone is one of the most underrated training aids. With The Cone, you are able to get instant feedback on whether you are taking the golf club inside the swing plane during the takeaway phase of the swing. An inside takeaway tendency is something that we see among a large percentage of golfers we teach.
In addition, during the downswing, a common error is to swing OVER-THE-TOP and hit weak slices and pull cuts. The Cone forces the player to deliver the club on a shallow plane (instead of steep) and as a result, use body rotation to square the club face through impact.