Aim. Muscle strength development is a priority of physical education and sports activities for all training cycles, due to the importance that the motor skills, strength-with its forms of manifestation and combinations with other skills-has in the manifestation of students' motor potential. The aim of our research was to study strength-with its forms of manifestation and combinations with other skills in special education in prison regime, which imposes distinct measures of approaching to educational process. Materials and methods. The study took place at Tichilesti Special Secondary School (Braila County) with prison regime for minors and youth, during the school year 2016-2017, for both semesters. The study was divided into two distinct stages, differentiated in two main learning units, i.e. in the first semester-18 lessons and in the second semester-8 lessons. Results. The statistical processing of the results-obtained by the students from the experimental group-highlights a strong and significant progress for all used tests, which confirms the statistic hypothesis and strengthens the privileged position that the work in circuit method holds in school physical education, in order to optimize the muscle strength. Conclusion. The results obtained through the implementation of the experimental curriculum confirm its importance and viability but the fact that the control group achieves significant and similar performance leaps to the experimental group, demonstrates that the other traditional methods of muscle strength education are useful and that they cannot be removed from the training process.