The research aims to investigate the particularities of the regime of physical activity in adolescents from Timisoara, Romania. The work sample included 243 students: 37.9% in middle school and 62.1% in high school; 56.4% girls and 43.6% boys; aged 11 to 18. The work method was cross-sectional population study of the case study type. The results indicate practicing physical activities in order to lose weight or not gain weight in over half of respondents: 57.3% of middle school students and 57.9% of high school students, more often girls. The boys in the age group 15 to 18 practice more often both moderate and intense physical activities than girls, and the number of days per week in which students participate in sports classes is more reduced in high school compared to middle school.