**6. Limitations of the study**

For the limitation of the study, we considered the sample size, because we did not calculate the expected sample size before beginning the study. We worked only with the sample with which we could realize interview. If we have had the access to a representative sample, then maybe we would have more precise results and we could generalize the results to a larger population. We will continue with this research, and we try to gain more respondents also from other parts of the Slovak Republic, not only from the capital city. The second limitation of the study is the selection of 50 items from the entire 93-item self-reported measure. Maybe for the school practice, also a short form with the 16 items would be appropriate. The third limitation of the study is self-reported data, because we gather the responses at the momentary time, when the person, in any mood, perceives the question and answers the question in a subjective manner. To overcome this, some introductory and motivational parts should be provided by the research leader before respondents start fulfilling the questionnaire. The fourth limitation could be that we did not determine the kind of sport. Maybe we would find several new information and which kind of sport has the greatest effect on the subjective dimensions of the quality of life. This approach would require the larger sample size. The fifth limitation could be the selection of the research papers in the introduction and in the

discussion because of our individual interest in some papers and not in others paper. We will try to make the larger scope of the next research, because this research is also limited in pages for publishing.
