Another exercise that has helped me with my putting is to concentrate on following through with your stroke.  Like many beginners / high handicappers I found it difficult to commit to a putting stroke; and the consequence is that I was not stroking the ball firmly or accurately enough.  The result of this lack of confidence is leaving the putt short of the hole.

Improve Your Putting

To improve your putting, try pushing the ball with the putter with no backswing.  Line your putter up against the back of the ball and simply push the ball forward to the hole.  This exercise taught me to follow through, resulting in a more confident, positive swing motion.