Here’s a more advanced version of the two-ball drill.
With the one-ball drill, you’ll get even better feedback on your ability to let the putter face stay square throughout the stroke and improve your tempo, too.
Remember, with a L.A.B. Golf putter you don’t have to keep the face square. You can let it stay square, and the one-ball drill will help you do that.
Here’s a link to the two-ball drill in case this is a bit too difficult at first: https://youtu.be/cOD2njTRXxI