I love obstacle courses. A lifetime ago I was very-part-time in the army, and I remember a morning on an obstacle course early on in our training. It was great – a little group of us blizted the course and left the others far behind. And as I swung across the final obstacle and crossed the finish line our sergeant-major leant forward and spoke quietly into my ear.
“Wouldn’t it be good,” he said, “If those who found it easy helped the others, so that everyone finished faster?”