Developing and testing the ExerciseGuide UK website for people with lung cancer: reflections on the added value of patient and public involvement within a doctoral degree

Background: Lung cancer has one of the highest incidence and mortality rates worldwide. Physical activity can provide those diagnosed with lung cancer with several physical and psychological benefits. However, the examination of digitally delivered physical activity to those with lung cancer is not as researched as other common cancers. Often, those diagnosed with lung cancer are older adults (65 years or older). Older adults are often wrongly assumed to lack digital skills, interest, and not engage with digital technology regularly. Although individuals are interested, would involving older people in designing of websites and apps result in better engagement? Main body: In this article, the authors discuss the process of adapting a digital platform with a patient and public involvement group to provide those who have received a lung cancer diagnosis with a tailored physical activity program and health educational modules. We discuss the influence of recurrent patient and public involvement on the study, the patient and public involvement members, and the doctoral researcher. Conclusion: Working with a patient and public involvement group over several months, especially potential users of a digital intervention, may enhance its relevance, accessibility, and usability. By engaging with patients, family, or caregivers for someone with lung cancer, the doctoral student gained insight into the needs of the study population and what to consider during development. All group members expressed their interest and enjoyment in their involvement, and several are now active members of a wider patient and public involvement network.