Cardiovascular diseases are the cause of more than 1.9 million deaths every year in Europe, and exercise has been shown to reduce cardiac mortality. High-intensity training improves cardiovascular function and is safe and effective in cardiac patients. Therefore, high-intensity interval training (HIIT) has been shown to offer various cardiovascular adaptations, which are extremely important for improving the quality of life of patients affected by a cardiac event. It has also been shown to be a very safe and effective intervention model, with excellent adherence on the part of individuals due to its short session duration.