In class I sometimes refer to Habit #7 in the late Stephen Covey's "The 7 Habits of Highly Effective People". I am a great believer in sharpening the saw by taking breaks and never carrying over annual leave days from one year to the next. I came across the video below created by Malkhaz Geldiashvili, and I think it is a great way to explain the 7 habits.
I don't know if I have ever met a "Highly Effective" person - very effective, yes. I certainly can't consider myself to be "highly effective" as I have a lot to learn according to Covey's list of habits. His book is one of those in my house that has been on a bookshelf for years, but I have not read it all. Perhaps it's time to dust it down and read it all? I'll report back later in the year if I do so!