GROUPS 4 HEALTH (G4H) is an evidence-based intervention that targets social disconnection and loneliness. It aims to give people the knowledge and skills to build and maintain their sense of social connectedness to enhance their health and well-being. Built around five modules that involve a range of activities and workshops, the strength of the G4H program lies not only in its ground-breaking new understanding of how to tackle social isolation, but also in offering an in vivo experience of positive group connection - allowing participants to learn and experience at the same time. G4H is suitable for anyone who is concerned about, or currently experiencing, distress due to social isolation and loneliness. It is a program that can be used as prevention, for those at risk of loneliness, or as a cure for those experiencing the health consequences of loneliness. This Workbook functions as a key resource with useful activities and worksheets that support client engagement with the program, and improve social disconnection and loneliness.