The purpose of the research- to investigate the influence of the physical education benefit’s understanding for the physical features’ change of both sexes 11th class schoolchildren in secondary school. Seventy nine schoolgirls and schoolboys, whose belong to the main medical physical ability group and attend Kalvarija secondary school, took part in our pedagogical experiment. The experiment was organized during the school year of 2004-2005. In September 2004 schoolchildren were distributed into two experimental (E1 group of 19 schoolgirls and 21 schoolboys) and two control (E2 group of 20 schoolgirls and 19 schoolboys) classes. “The experimental program of knowledge education” was applied for group E1, group E2 had the same physical education lessons as earlier. Research methods used in a Masters thesis were as follows: analysis of literature, questionnaire method, physical features’ testing, statistical analysis. After the questioning of schoolchildren it became clear, that physical education��s knowledge and it’s influence for the change of schoolgirls’ and schoolboys’ physical features, also factors making impact for approach to have sport are very important. EUROFIT and other physical tests were used to identify physical features of pupils. The results of questioning the schoolchildren shown, that only about half of them think, that physical education lessons are meaningful. It’s reasons could be the lack of physical education knowledge and the absence of textbook of... [to full text]