This case study describes a consultancy project undertaken in the context of a cardiac rehabilitation service. The client was a multidisciplinary team of healthcare professionals who delivered cardiac rehabilitation, all of whom were employed by a large specialist cardiothoracic National Health Service (NHS) Trust in the United Kingdom (UK). The request for consultancy arose through a partnership between the NHS Trust and a local university and was delivered through a PhD studentship. As well as the client, key stakeholders were the Trust’s research unit, patients attending cardiac rehabilitation, and a multidisciplinary academic supervisory team. Although only 15% of cardiac rehabilitation services across the UK have access to a psychologist (British Heart Foundation, The national audit of cardiac rehabilitation: Annual statistical report. Retrieved December 20, 2019, from https://www.bhf.org.uk/informationsupport/publications/statistics/national-audit-of-cardiac-rehabilitation-quality-and-outcomes-report-2019 , 2019), there is little understanding of how behaviour change is integrated into cardiac rehabilitation service delivery. The project aimed to enable healthcare professionals to deliver behaviour change interventions within their routine practice. Through the case study, I reflect on how the relationships developed throughout the project allowed me to focus on health psychology in a setting that typically prioritises medical trials. I also reflect on my work as a PhD candidate in a project that required me to delicately balance the demands of academia and practice.