This pilot study will determine the feasibility of introducing a supported exercise programme to clinical practice. The investigators aim to assess if improvements can be made in both physical and psychological well-being for adults with CHD who are living in Scotland. After initial assessment and baseline measurements are obtained, participants will follow a twelve week individualised programme. The investigators will keep in regular contact with the participant throughout and arrange interval and final assessments. The baseline measurements will be repeated during the final assessment at 12 weeks. Investigators anticipate that the study will also help to establish a programme that will help to improve the way adults who were born with a heart condition can be supported with physical activity on a long term basis.