During a recent family chat about training for a half-marathon, I asked my sisters if they knew what you were supposed to do with your hands when running. Should you grip your fists like a boxer? Or just let them shake loose?

“Well…”, said the sister who was training, “Apparently you are supposed to pretend you have a piece of paper between your thumb and forefinger, then hold on to it, but not too tight”.

“Hold on, but not too tight?” says my other sister, “That sounds like great advice for pretty much everything!”