Imagine practicing a scale on the guitar. You could just repeat the scale over and over, but you could also add rhythmic variation, or play two notes up and one note down.  Based on the article, it doesn&#x27;t seem like moving the goalposts (ie, fret spacing) is the critical point, it&#x27;s just that you don&#x27;t want to just blindly do the same thing over and over and hope to get better.