The purpose of this study is to investigate the effects of the 8-week high intensity circuit training method on circulation and respiratory system and body fat ratios, which is applied to university students and students with similar sports backgrounds. The participants of the study were at least 5 years of sports age (N = 60) who are educated in Istanbul University of Development and Physical Education and Sports (n = 30) volunteers who were randomly sampled by non-random sampling methods. Body Composition Measurements were analyzed by measuring the body fat ratios and body mass index in the Istanbul University of Development physical education and sports high school performance measurement laboratory and blood pressure was determined by the detection of diastolic and systolic blood pressure. Respiratory parameter measures were determined by cardiopulmonary respiratory function test at Chest Diseases Department of Istanbul University Cerrahpasa Medical Faculty. All measurements were performed before and after the 8-week program. As a result, pre- and post-training diastolic blood pressure results of participants were significantly different between forced vital capacity and forced vital capacity values of 1 second (p> 0,05), A significant difference was found in systolic blood pressure results before and after training (P> 0,00). There was a significant difference (P> 0.00) between the body mass index results and the weight and fat ratios of participants before and after training. Combined resistance training in combined with high severity contributes to the use of fats as an energy source during exercise and to the weight loss process.