I recently made the observation that the kids are much more interested in the puzzle sheets when they try to solve them together. I often get an initial negative response to puzzle sheets. At one stage, I tried to encourage them to do the puzzles by awarding tournament points for solved puzzles. The result was not so great. The kids who know that no trophy awaits them at the end of the term anyway don't feel motivated by such points and the kids who could get a trophy are not the ones which shy away from chess puzzles.
In some classes, the kids have started to solve the puzzles together. When they work together, their results are much better. Sometimes I have to force the kids to stop puzzling and start their games. The same kids who complained about having to do puzzle sheets a few minutes ago. 
Sounds like a load of bollocks to me. 'sharpen the saw'? hehe..
That's understandable, since these titles alone don't explain entirely what each principle is about.If I'd see a sign which reads 'Grand Canyon' and I had no connection to it whatsoever, I wouldn't necessarily be impressed and might decide not to check it out. And miss a great view.
Additionally, certainty is a primary human need and undoubted doubts fill that need easily.
Sharpen the saw means that you incorporate weekly or daily improvement or maintenance in your life. Staying healthy, continuous learning. Keep developing and training good character traits. Half of the american population is overweight, so they obviously do not sharpen the saw in that aspect. Although it feels so damn good to be fit and strong. They really miss out.
Be proactive means to not let outside circumstances decide for you when you actually decide your own response, your own feelings. No blaming anymore. A way of saying: You are the programmer.
Begin with the end in mind means to write the program. What's your life about? Where do you want to be in ten years? Where do you want to be in a year? Health, work, finances, friendships. What kind of person do you want to be in ten years? How much integrity, how much courage? Acting according to principles and good goals Instead of getting distracted by outside demands.
Bartleby:
That's what 'Think win win' and 'Synergy' are about. And children are initially more open to these concepts.