The objective of this study is to determine the impact of an original fitness model, based on circuit training on the level of physical quality muscle strength of female students of Trakia University. The testing was conducted in the academic year 2016/2017. A contingent of the study were 69 female students of secondary age 20,04 years from the first and second year of three faculties of Trakia University - Economics, Agricultural, and Veterinary Medicine. They were divided into two groups. In an experimental group of 36 female students circuit training twice a week for 30 weeks had been conducted. A control group of 33 female students, were trained according to an approved curriculum for the discipline "Physical Sports and Education". To achieve the objective, we used the following methods: testing, pedagogical experiments, analysis of variance, comparative analysis, and graphical analysis. Their results and analysis showed that the experiment was successful and the developed fitness program is effective. The author's fitness model based on circuit workouts improved the muscular strength of female students.