Background: We sought to describe the development of the fitness profile of male at secondary school participating in the research, based on the results of the Hungarian National Student Fitness Test (NETFIT) tests, and also how their physique characteristics affect the results of NETFIT tests in the sample we measured. Methods: 439 male high school students at secondary school (14–18 years old) (mean ± SD, 17.0 ± 1.2 years) participated in the survey. The correlation between the performance indicators of the NETFIT tests and the indicators of physique characteristics were analysed by the two block Partial Least Squares method. In the resulting groups, Kruskal-Wallis variance analysis was performed to investigate the differences in performance between the groups, while pairs of group differences were tested with the Mann-Whitney test. Results: Boys with a short physique were at some advantage in trunk-lifts and push-ups compared to taller boys. It was also obvious that overweight is a hinderance in the PACER test or the standing broad jump. The handgrip in the left and right hand was mostly of similar strength or weakness. Tall-heavy children clearly performed better in this test. The grip strength of tall-thin students is also strong but not as strong as in the tall-heavy group. Conclusions: Reducing the percentage of body fat (PBF) and creating the optimal BMI index is important for the younger age group, as our results have clearly demonstrated that overweight is a hinderance in the PACER, VO2-max, standing broad jump, back-saver sit-and-reach and push-up tests.