The aim of this study was to investigate the relationship between daily lifestyle and anthropometric parameters in secondary school boys, aged 10-12 years. The study included 128 male students in secondary school, healthy and voluntarily. Anthropometric and metabolic parameters of the participants were measured before the study. The daily step counts (STEP) were measured by SenseWear® Armband for 6-day without physical education classes. To determine whether the students had active or inactive daily lifestyle habits, STEP values were assigned to three different levels according to the classification of Craig et al. (2013): passive group (PG), normal group (NG), and active group (AG). One-way ANOVA, multiple comparison, and Pearson correlation coefficient tests were used. P<0.05 was considered significant in all tests. In multiple comparison tests, some anthropometric parameters and STEP averages were significant in favor of AG (p<0.05). There were moderate (r=-0.60) or high (r=0.81) linear relationships between STEP averages and mean values of the anthropometric features (p<0.01). It was concluded that the anthropometric parameters and daily step count of male secondary school students have a significant effect on daily lifestyle habits.