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77 ABSTRACT Physical activity is an important element and criterium for a healthy lifestyle. The level of physical ability determines the degree to which an organism adapts to its environment and therefore the development and condition of all the other personal qualities depends greatly on it. One of the elements of physical ability and fitness is the main motor qualities – speed, strength, endurance, agility, flexibility, balance, coordination of movements. The aim of that study is to reveal the major factors of physical ability of 13-14-year-old pupils, as well as to determine to what extent gender differences influence the level of physical ability between boys and girls of one age group. We used variation, factor and comparative analyses when we processed the results. According to the general conclusions, for both boys and girls there are three major factors with a very high percentage to the initial dispersion of the surveyed phenomenon. We can sum up that in this age group the established gender differ­ ences have a very big impact on the physical ability of the pupils, and these differences regard mostly the explosive power of the lower limbs, the speed abilities and the endurance of the kids, the advantage being totally in favor of the boys.

FACTOR STRUCTURE AND MAJOR FACTORS OF PHYSICAL ABILITY OF 13-14-YEAR-OLD PUPILS