“Mindfulness”. Most of us have heard of it, some of us may have actually tried it, but how many of us know exactly what it means? This troublingly vague term can be applied to almost anything: mindful breathing, mindful cooking, mindful cleaning, mindful colouring-in. Is it just another way of describing good old-fashioned relaxation? A fancy form of meditation? Or an offshoot of that other mental-health buzz term, cognitive behavioural therapy?