High-intensity interval training (HIIT) consists of alternating periods of intensive aerobic exercise with periods of passive or active moderate/mild intensity recovery. The purpose of the present study is to motivate other researchers to conduct a study on High-intensity interval training (HIIT) and spread knowledge about this training. this article was compiled through previous studies which are available on the internet, in theses, and in books. Search through Electronic databases to identify all related articles on HIIT and its impact or effect on the human body. Through this research or investigation, we have found that HIIT has lots of benefits like burning calories, improving muscle mass, improving endurance, maintaining a healthy heart, helping in maintaining diabetes, improving aerobic capacity and anaerobic capacity, and improving explosive strength. From this study, it was concluded that High-intensity interval training (HIIT) is very beneficial to maintaining good health, and it’s recommended to perform any kind of High-intensity interval training (HIIT) at least twice a week