This randomised controlled trial (RCT) aims to investigate the effect of long-term, interactive home-based cycle-exercise on patients with Chronic Obstructive Pulmonary Disease (COPD) after a COPD exacerbation requiring hospitalisation. The investigators aim to investigate if patients can maintain or improve the effects of pulmonary rehabilitation in terms of walking distance, intensity of COPD symptoms, health related quality of life and Quality Adjusted Life-Years. Participants will cycle on a pedal-exerciser in the comfort of staying in the participants' own home, whilst getting visual feedback from the 4Mvideo app. The 4Mvideo technology is a Danish designed software system, where users can cycle forward a recording of a cyclist by treading on a pedal-exerciser, thereby getting some of the experience of a real-life cycling trip at home. The investigators will compare the clinical outcomes and daily activity levels with that of a control group consisting of COPD patients.