Exercise training is a core component of cardiac rehabilitation (CR) and is associated with improvement in (sub)maximal exercise capacity, quality of life, and a reduction in the risk of re-hospitalisation and mortality [1]. However, improvements in exercise performance only partially translate to changes in sedentary behaviour (SB) and physical activity (PA) following exercise-based CR[2,3] and after 1 year of follow-up [4]. Therefore, it is important to individually tailor exercise training and physical activity prescription to optimise out-patient CR programs.