In this age of distraction . . . Of smartphones and Instagram. Of texting and Snapchat. Of clickbait and information overload. . . . being able to focus on one thing for an extended period of time is a superpower. It gives you a distinct advantage regardless of your field of endeavor. For today’s students, and in the years to come, single-tasking will be an even greater commodity. This is one reason why lengthy independent practice is a core principle…