Alignment — not stroke mechanics — is where most putts go wrong. And it's the hardest thing to practice on your own.
Even a few degrees off at address sends the ball off-line before you ever take the putter back.
Without a second set of eyes, it's nearly impossible to know if your shoulders, feet, and putter face are actually square to your target line.
Chalk lines, mirrors, and mats are bulky, single-use, or stay bolted to the practice green — not something you bring to the course, a hotel room, or home.
Alignment influences the initial line of every single putt you hit — long before feel or speed come into play.
You can't see your own setup from behind the ball, which makes it the blindest spot in your entire game.
Most practice time goes to stroke feel and speed control — start-line accuracy is often left to chance.
Every golfer has stood over a putt that felt perfect and watched it miss the line entirely.