Cardiovascular diseases are increasingly common diseases around the world. In such diseases, cardiac rehabilitation is a solution that leads to a reduction in disease and an increased healing rate of such patients. Continuous moderate intensity training, which is the most common way of training in these patients, has found its place here. However, in recent years, interest in HIIT training has increased, due to its many positive effects on the body. HIIT would be defined as training with repeated sets of exercises of short to moderate duration (10 seconds to 5 minutes) with an intensity greater than the anaerobic threshold. The effectiveness of HIIT training is sometimes more significant in some aspects compared to continuous moderate intensity training. The positive effects of HIIT training are numerous: improved cardiac parameters, increased quality of life, and reduced morbidity and mortality from cardiovascular diseases. Nevertheless, there is some fear with the idea of implementing HIIT training in a regular cardiac rehabilitation regimen due to the thought that HIIT training increases the risk of cardiac incidents compared to continuous moderate intensity training. However, HIIT training has been shown to be a safe option for physical therapy, which has a significant effect on maximum heart rate, maximum oxygen consumption rate measured during gradual exercise (VO2 max), and metabolic equivalents of tasks. Therefore, only individual adjustment of training to the patient with strict screening remains, so that such training is safe and effective to use.