Are you three putting greens because of poor lag putts? If so, I have the perfect drill to improve you pace on long putts and get a better understanding of the speed of the greens. To begin, set up a semi-circle of tees one club length behind a hole. This forms the "bucket". Place ten golf balls twenty feet away so you will be putting into the bucket of tees. Try to get each putt past the hole but not past the tees. Reset and redo the drill when it is completed. Be sure to practice this drill on uphill and downhill putts. With some practice, you will be well on your way to reducing your three-putt greens.