Striking a careful balance between theory and practice, the book first reviews what is known about positive psychology and health, presenting a novel approach to holistic wellbeing. It then goes on to provide more than 100 tools designed to increase physical, mental and social health and wellbeing, and also to decrease the risk of illness and disease. The tools described can be used by people of all ages, whether well or experiencing illness. It includes tools that you can use to improve your nutrition and sleep, to increase your physical activity, to develop positive relationships, to develop a positive mindset and to pursue a meaning in life. These tools provide research-informed, practical advice to help you to make lasting changes and become the best possible version of yourself. This book is invaluable for anyone who wishes to maintain and enhance their health and wellbeing using tools that have been shown through research to be effective. It is also a key text for students in positive psychology and healthcare, as well serving as an evidence-based reference book for coaches and health professionals who wish to recommend research-informed tools to their clients and patients.