 In this randomised, double-blind, pilot study, the investigators aim to assess whether a telerehabilitation strategy could improve outcomes among patients with recent heart surgery. Included participants will receive a comprehensive rehabilitation programme comprised of physical therapy, nutritional counselling, psychological assistance in addition to standard medical care. After 12 sessions of physical therapy, patients will be randomised to receive telerehabilitation with a portable EKG device and a smartphone application or usual care. The primary endpoint for this study is the exercise capacity of included participants, which will be assessed using an ergospirometer at 4 and 8 weeks after randomisation. 