[DrBrightonone]

I have two good putting exercises. One is with a ball from Ping that has one white and one bright pink hemisphere. You line it up so when you putt, the ball rolls straight along the dividing line. This tells you if you are pushing or pulling as well as cutting across the ball.

The second one is two balls stuck together with a bit of silicone. You try to putt both balls so they roll together in a straight line. I will almost guarantee that at least the first few times, it will go around in a circle instead of straight.