Background:
Lung cancer, with its high global mortality, has seen limited exploration in tailored exercise interventions, particularly digital ones. ExerciseGuide UK, a novel website offering personalised exercise programs and resources for those living with and beyond lung cancer (LWBLC), was developed. The feasibility and acceptability of the intervention were examined using the Pillar Integration Process (PIP). This approach bridged the gap between digital health innovation and the specific needs of this underserved population.

Methods:
Eighteen participants (mean age 65 ± 14.42) were recruited. Feasibility was assessed through metrics such as screen-to-consent ratios, retention rates (66.67%), and reasons for ineligibility (e.g., lack of digital access). Acceptability was measured using the System Usability Scale (SUS), post-study questionnaires, and interviews. PIP synthesised findings across three pillars: Feasibility, Acceptability, and Barriers to Engagement.

Results:
Feasibility themes included recruitment, retention, sample size, and participation. Acceptability themes included perceptions of digital design and usability, impact on physical activity attitudes and behaviours, perceived value for cancer care, and burden. Barriers to engagement were identified as digital accessibility, complexity, health-related outcomes, and timing. The SUS score of 72.12% (±14.15) indicated good usability. PIP revealed reduced website usage due to participants reaching "learning saturation." The platform’s flexibility and its impact on managing breathlessness significantly improved quality of life, highlighting the importance of context-specific interventions.

Conclusion:
ExerciseGuide UK demonstrated moderate feasibility and high acceptability of digital health interventions tailored to those LWBLC, bridging critical gaps in exercise oncology. The PIP provided a comprehensive integration of diverse data, offering novel insights into the contextual factors influencing engagement with digital tools. These findings underscore the need for equitable, patient-centred eHealth solutions in oncology care. Future research should focus on large-scale efficacy studies and strategies to ensure that digital interventions are accessible to all, addressing both the physical and psychosocial needs of those LWBLC.