Michael Breed, one of Golf Digest’s 50 Best Teachers in America, is a self-described swing junkie. A couple of years ago, he noticed that the longest hitters keep some bend in their trail arm coming into impact. At impact, “The arm is straightening, but it’s not straight,” he says.

This straightening of the trail arm has a major effect on other parts of the game, particularly iron play and pitching. With irons, it promotes solid contact because it helps you stay in posture through the shot. On pitches, it controls the loft at impact for predictable trajectory and roll.

In short, this one move can give you the things you probably want the most—more driving distance, quality contact on iron shots and better control with the wedges. Click here for Breed’s full explanation of how this one simple move can upgrade your entire game.