The problem: An uneven swing tempo, which makes it harder to square up the clubface at impact.
Simple fix: A lot of golfers use metronomes to help improve their rhythm, but a lot of pros just use the sound of their own voice. "Metronomes are useful for practicing putting," says Goldstein, "but on the practice tee, your own voice is just as good. The great Sam Snead used to just say, 'Water...melon.' The words don't matter. You just want to be smooth back, smooth through. Remember, tempo isn't the same as speed. It's okay to be a fast swinger, but the swing still needs to have consistent tempo."