This article discusses the effects of training in cardiac rehabilitation and describes the influence of various training modalities on the evolution of exercise capacity in cardiac patients. Both home- and hospital-based studies are analysed separately. From the collected studies, a very heterogeneous character of the content of the rehabilitation programmes appears. Direct comparison of the effects of the training programmes on exercise capacity remains difficult. Baseline factors for predicting a better training outcome are: low exercise capacity and peripheral oxygen extraction; presence of hibernating myocardium; high myocardial perfusion; low degree of coronary vessel occlusion; working status; and improved feelings of wellbeing. The increased work capacity as a result of rehabilitation is associated with: an increased volume density of skeletal muscle mitochondria; peripheral muscular vasodilatory capacity; cardiac output and a decreased left ventricular end-diastolic pressure; depletion of muscular phosphocreatine levels; and degree of restenosis. Home- and hospital-based interventions induce comparable training effects. More research is needed concerning the training modalities in cardiac rehabilitation. There is an influence of weekly training frequency and programme duration on the training outcome. A higher training frequency and/or duration might induce greater training effects. The evolution of the anaerobic threshold is sensitive to the training intensity and inclusion of strength training, which remains to be established for maximal exercise capacity. However, insufficient information is available on the influence of training session duration on the evolution of exercise capacity.