Expert advice
Gabriele Oettingen is an academic and a psychologist. She is a professor of psychology at New York University and the University of Hamburg. Her research focuses on how people think about the future, and how this impacts cognition, emotion, and behaviour. woopmylife.org
Houston Kraft is a professional speaker, an author, and a curriculum developer, working with more than 100 schools to support the teaching of kindness in education. His latest book is Be Kind: A 52-Week Journal For Practicing Kindness ( Simon & Schuster, £6.99). @houstonkraft
Courtney Ackerman is a research scientist and evaluator of mental health programmes. She is the author of several books, including My Pocket Meditations For Self-Compassion, My Pocket Positivity, 5-Minute Bliss and My Pocket Gratitude (Simon & Schuster). @courtneyeackerman