Below is the universally accepted PGA arc putting training mat and the road map used by all the top PGA pro golfers on tour today. The yellow curve denotes the path the center of the putter head should travel. The white dotted line denotes the target line. The straight lines which are perpendicular to the arc denote the club face and its orientation through out the putt.
Both YellowDog and YellowDog Glide Stroke are configured to track this curved arc perfectly
Once your putter is engaged with the YellowDog putting training aid it tracks this technically and fundamentally sound putting arc perfectly. The putter head also remains square to this arc for the duration of the putt. So every putt you make a perfect stroke.
This is a natural body friendly motion that is easier to perform and repeat. You are now practicing the perfect putting stroke. Repeatable 100% of the time.