The cardio concept offers new possibilities in cardiac rehabilitation, from interval through rotational training up to comparative training methods. All data can be observed by means of real-time ECG via a central cardio concept monitor. The patient wears the recording device on the body throughout the rehab training. Thus the ECG recording is not bound to any special endurance machine. With this new state-of-the-art technology the therapist is free to select the optimal rehab method. Consequently, the therapist has the free choice between ergometer, treadmill, cross trainer or floor exercise. The therapist can observe the cardiovascular effects of each individual training method in real-time and respond immediately by adapting the training or choosing another training method.