Are you a smiler? Chances are you could make a bit more effort. And help influence others too. We all know the Mr Misery in the office or Ms Glum at the petrol station. Get them to smile more. It takes up half as many muscles as it does to frown and it makes you and others feel twice as good.

Smiling also makes you appear approachable and more attractive. It says: ‘I like you, you make me happy, I am pleased to see you.’

People can even tell when you are smiling from the intonation of your voice. So smile when you’re on the phone. Start the day with a smile. Stick a reminder on your bathroom mirror.