Training sessions with constant level of work load are most often used in cardiological rehabilitation. They are beneficial in secondary prevention of ischemic heart disease and to some or other extent are familiar to practical physicians. At the same time interval training appearing as sequence of short periods of high and low intensity work or pauses are rarely used due to their relative novelty. This variant of training has advantages and can be a method of choice for patients with CHF. In this review we summarized data on interval training available at present, considered problems of methodology, efficacy, and safety of this training, compared its various parameters with those of training with loads of continuous intensity.