Adolescent's spine is highly mobile and flexible. Long tubular bones of upper and lower limbs grow rapidly as well as vertebrae grow faster in height. Most intensive growth of up to 7 cm per year occurs with girls in the age of 11 - 12 years ( Obukhova, 2011). The most intensive growth rate of boys occurs in the period of 13 to 14 years when the body grows 7-9 cm in length. Body weight increases annually by 3-6 kilograms. Annual growth of 4 - 7 cm in length is achieved mainly by the growth of legs. Middle school age is characterized by an intensive growth and increment of body size. Middle school students are 12 to 15 years old. This is to a major extent the positive influence of the physical training as of one of the most powerful factors of health improvement ( Weinbaum, Kovalko & Rodionov, 2002). Systematic exercises of physical culture and sports result in continuous development of body mechanisms, regulating the work of all organs and human body systems. Since one learns not only to play this or that kind of sport (if game sports are taken into account), but also to work in a team, use strategy and tactics, to lose and to win, maintaining relations with rivals and team members within a limited territory (especially in competitive activities), make own decisions not only in game, but in life as well ( Kovalko, 2013). Whereas sport is frequently being referred to as a school of life. Physical culture, being a part of general culture, allows for child's development and preparation for further self-managed adult life. Insufficient motional activity at school and at home resulting in hypokinesia threatening the undesired changes of a student's body has been observed quite frequently during the last several years ( Grishina & Volkova, 2019). Sufficient motional activity is a precondition for harmonious development of a student's personality. Palabras clave: Agilidad celeridad cultura física juegos ágiles ejercicios especiales para correr edad de escuela intermedia Los materiales del artículo podrían ser de utilidad para estudiantes de las facultades de entrenamiento físico y deportes, pedagogos de entrenamiento físico de escuelas secundarias, escuelas intermedias y superiores, así como para maestros de educación obligatoria. Los estudiantes de facultad física pueden usar estos juegos para desarrollar agilidad durante las clases de entrenamiento físico, durante la actividad extracurricular y durante el período de práctica pedagógica. Se dedica una atención separada al desarrollo de un conjunto de juegos de movimiento para estudiantes de secundaria. Este estudio presenta los medios más efectivos para el desarrollo de la agilidad. El método de investigación líder es el método de juego de los juegos activos durante las clases de entrenamiento físico. El objetivo del artículo es desarrollar un conjunto de juegos activos para desarrollar la celeridad con los niños de la escuela secundaria. Pero sucede con bastante frecuencia que los niños pierden el interés en el entrenamiento por razones de complejidad y monotonía. Los ejercicios para desarrollar la agilidad incluyen ejercicios especiales de carrera: carrera por intervalos y carrera de relevos.
Hay varios métodos de desarrollo de agilidad utilizados activamente por los entrenadores durante las clases de entrenamiento físico. La relevancia del tema del estudio es que la adolescencia es el período de vida más adecuado para el desarrollo de la agilidad. Keywords: Agility celerity physical culture agile games special running exercises middle school age The materials of the article could be of use to students of the faculties for physical training and sports, physical training pedagogues of secondary schools, middle and higher schools, as well as for teachers of compulsory education.
Physical faculty students can use these games to develop agility during the classes of physical training, during the extracurricular activity and during the period of pedagogical practice. Separate attention is devoted to development of a set of motion games for middle school students. This study presents the most effective means for agility development. The leading research method is the game method of active games during the classes of physical training. The goal of the article is to develop a set of active games to develop celerity with kids of middle school. But it happens quite often that kids lose the interest in training for the reasons of complexity and monotony.
Exercises developing agility include special running exercises: interval running and relay race. There are various methods of agility development actively used by coaches during classes of physical training. The relevance of the issue of the study is that adolescence is the most suitable life period for development of agility.