Watch 123Movies. Is there a secret formula to happiness? We all struggle sometimes, but what does it mean when we struggle? We all experience strong emotions, but what should we do about them? We all want to be happy - but what is happiness and why is it so elusive? Positive psycho-therapist Marie McLeod takes on a group of volunteers with mental health issues and offers them interventions grounded in positive psychology, neuroscience and wellbeing science.