I’m a big fan of New Year resolutions. I like them so much that I make them all the time, not just once a year. It’s true that the ones I make, don’t always last. But I’ve been grappling with the problem for years and, I think, I’m making progress. Here’s what I’ve learnt.

First things first: start with more than one resolution. That way, if you run aground on one, you can work extra...