A number of methods have evolved for assessing our health in parallel with the expansion of scientific knowledge. Medicine describes our health through objective methods and measurable variables. Of course, we also have an image of our own state of health, which, for all its subjectivity, is a good indicator of our physical and mental processes. Our sense of health can be a genuine reflection of our state of health, which directly and indirectly affects our professional/academic performance. We have a constantly expanding knowledge of the beneficial effects of the increase in physical activity on health, and its mechanism of action can be interpreted from a number of aspects. The examination of the health and physical activity of the secondary school age group provides useful information for individuals, parents, and those working in the field of education (education policymakers and educators). In this research, we examined the relationship between the level of physical activity (relative to the recommendations of WHO) and the sense of the health of high school students, their school performance, and the appearance of various emotional factors. Then we complimented it with a study of the motivational background for those aged 14 to 18. During the analysis, we identified a significant link between high levels of physical activity and the high quantified value associated with the sense of health. We found no significant correlation between academic performance and physical activity levels. We experienced a significant relationship between emotional factors when comparing the categories of happiness, mood, energy, as well as sadness, and fatigue with physical activity. Among the motivators for exercise, the improvement of physical condition is prominent, and this age group clearly rejects the expectations of others. It is also instructive for those working in the field of physical education that the experience of exercise is critical for members of the age group.