One of my favorite short game training aids is the Pelz putting tutor. Reason number one is it’s simplicity. Secondly, I can have players tell me how much break they think they see on a putt and I’ll set up the putting tutor according to their line. I find that the majority of amateurs do not play enough break so this really gives them a better understanding of where they should be aiming. I also find this helps a players green reading and speed control. Lastly, it helps a player hit putts with a putter face that is perpendicular to the target line which especially helps on shorter putts. These factors combined make this one of the top training aids for putting I use with students.