The humble putting mirror is a pocket-sized training dynamo. Its alignment lines (black down the center for the correct swing, red boundary lines to keep you in line) are easy to follow as you look straight down at the putter. The mirror enables you to see the angle of the putter and the alignment of your body to the club, the ball, and the cup at the other end of your shot. The ball is placed in a designated spot at the outward edge of the mirror, where it rests as you line up your body, grip, and putter. The black line guides your swing and follow-through. Practice with the mirror regularly, and you’ll develop the keen muscle memory and mental focus needed to achieve the same alignment during a game.