Cardiovascular disease (CVD) is the leading cause of premature death and disability in Europe, accounting for four million deaths annually. Exercise-based Cardiac Rehabilitation (CR) can reduce the impact of CVD by lowering mortality and morbidity rates and promoting healthy active lifestyles. Yet adherence within CR is low. Common adherence issues relate to accessibility/parking at local hospitals, a dislike of group environments and work/domestic commitments. Mobile health (mHealth) is an emerging area of healthcare, defined as “medical and public health practice supported by mobile devices, such as mobile phones, patient monitoring devices, personal digital assistants and other wireless devices”. Research suggests that mHealth interventions can be useful in supporting the self-management of chronic disease. The purpose of this research is to report on the development of an mHealth intervention.