If you've ever stood around the practice green at a PGA Tour event, you've likely seen players using a thin string as they putt. It’s called a start-line string or an alignment string, and it's one of ...

Rory's longtime tendency is to extend his arms out on the backswing and keep his right arm high as he does it. This may work for some golfers, but as he discussed with Golf Digest last year, when this ...