The present study aimed to assess the capacity of stability and motor impact in the development of the balance of student athletes by reducing the support surface on the ball in the up plank position, by using three categories of balls of equal size, but with different elasticity and weight. In this study, the second aim was to investigate the differences in maintaining static balance, on different balls, between those who are practicing individual sports or team sports. The total study sample include 48 students, active athletes (45.8% of individual sports and 54.2% of team sports), age X ± SD 18.74 ± 1.94 years. The research included two test sessions (initial and final) applied in two stages. The static balance tests were performed by measuring the time maintaining the up plank position with two and three points of support on the three balls, with different characteristics of elasticity and ranges of deformation: medical ball, handball ball and fitness ball. The results of the study showed that the superior initial and final results were recorded on the fitness ball, and the inferior results on the medicine ball. The upper difference was recorded at the up plank position with two support points (arms, legs) on the fitness ball, at 4980 sec., and the lowest in the same test on the medical ball, at 3420 sec. The largest difference was recorded at the up plank position with three support points on the handball ball, at 7.082 sec., and the lowest in the same test on the medical ball, at 3.093 sec. The subjects of the study perceived that the most difficult position to execute was the up plank position on the medical ball with two support points, with 43.8%, and the easiest stability was registered in the up plank position on the fitness ball with three points of support, of 37.5%. The relevance of the research results from the possibility of using different balls in conditions of positioning and body posture with a diminished support base in order to improve physical fitness.

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The aim of the research was to implement an athletic program to improve the explosive force in order to optimize physical fitness at the level of elite football-tennis players and evaluate the progress made through specific tests using the Opto Jump. The research included 10 elite European and world-class players, on whom an experimental program was applied in order to improve the explosive force of the limbs in conditions of speed, endurance, and dynamic balance. Study tests: five vertical jumps on the spot, on the left/right leg; five back and forth jumps on the left/right leg; five left/right side jumps on the left/right leg; vertical jumps on both legs 60 s; BFS vertical jumps. For each test, the following parameters specific to the explosive force were statistically analyzed: contact time (s); flight time (s); jump height (cm), jump power (w/kg); RSI—Reactive Strength Index, defined as Height (m/s). In the study, the average value of the parameters specific to the jumps performed in each test was taken into account. During the study, the tests were performed and processed on the Opto Jump device and software. In all tests of the experiment monitored through Opto Jump, significant progress was made in the final test compared to the initial one, which demonstrates the efficiency of the physical training program implemented for the development of explosive force, with an impact on the sports performance of elite players. The most relevant results obtained for the left leg regarding the improvement of the explosive force of the lower limbs materialized in the jump height parameter was in the test of five vertical jumps on one leg on the spot, and for the right leg in the tests of: five back and forth jumps and five left/right side jumps. The most significant advances in the study were in the tests, in descending order of their weight: 60 s vertical jumps on both legs; five back-and-forth jumps and five left/right side jumps, five vertical jumps on one leg standing, and BFS vertical jumps.

During the game the cognitive processes underlying decision making, both in attack and in defense, tactical skills, positioning players, occupying various positions, anticipating the opponent phases and movement are essential to victory. In soccer and not only, results are often the best indicator of a team’s performance but insufficient to a coach to assess his team performance.Video analysis, interpretation play on this method but a means of training comes and creates capacity for adaptation and response team and players from different areas and different football game The more information the player gets during training, in the meeting room and thisrepeats each day, the more he becomes aware of what he has to do in the field. If video images are perceived in the beginning (9-10 years) as motivating images for a particular execution and its correctness, then the same video and video analysis (if we speak about individual and individualization) can be used to better perceive the tactical position which he has to adopt on a certain stage of the game.

Engineer, composer, architect, theorist, mathematician and even astronomer, in all these hypostases Iannis Xenakis seems to be an arche-tekton in the first meaning of this Greek word - the (old) one who knows the secrets of making a Construction, be it music, architectural object, structure and/or idea, living the “dream of life” in the context of the only arts that do not make mimesis, architecture and music. Without presenting in itself the projects in which he has left its mark, the paper explores “the symphony of the dream of life” as Iannis Xenakis crystallized it through the filter of architecture. The symbolic participation in this “concert” brings to light an Iannis Xenakis in a constant attempt to rewrite in modernity and avant-garde, in mathematical key, the architecture, the music and the philosophy belonging of its Greek cultural matrix, exploring the halo of meanings of the triad kosmos-polis-oikos and their re-semantizations as he understood it in his times. The “symphony of the dream of life” as crystallized by Iannis Xenakis may reveal us that the Road is an infinitely more important goal than the finality in the journeys of architecture, music, and man on the scale of history and at the scale of a human life, as is the story of any arche-tekton, semper inter mundos, constantly questioning the boundaries of the kosmos, in any of the “real” realities or virtual realities would he and it coexist.