Abstract: The paper studies the entertainment activities concept, its role within the educational system, upbringing and children’s leisure time organization for the purpose of their psychophysiological health and development ensuring. The author believes that the entertainment activities concept is actively used at the present time in the practice of organizations and institutions of all forms of ownership in different educational and leisure events for the purpose of children’s optimal psychological and physiological health and development improvement. This fact causes the need for the conceptual analysis of this category to include it into the categorical framework of pedagogics and medicine. The author applies the statistical method, the method of historicism, comparative-legal study, the functional method, comparison, analysis and interviewing. Upon condition that the recommendations of this study are observed, entertainment activities in sports and recreation organizations for children can become the modern creative link for the use of any other pedagogical, psychological, cultural, educational and leisure technologies, thus ensuring the optimal psychological and physiological health and development of children. 

Abstract: This article is devoted to the study of the nature, goals, objectives, functions and elements of the system of preventive measures and avoidance of deviant and delinquent behavior of children in children's sports organizations in the Russian Federation. The author substantiates the position that one of the most important areas in children's sports organizations is the activities related to psycho-physiological health, moral education, cultural and creative development and education of children in difficult life situations (including adolescents with deviant behavior and delinquency). In this regard, special attention should be paid to analysis of peculiarities of formation and functioning of system of prevention and prevention of deviant and delinquent behavior of children in activities of children's sports organizations. According to the author, only the implementation of the totality of measures in children's sports organizations can prevent deviant and delinquent behavior of children and avoid violation of social norms by minors with deviant behavior in the future, but reveal their cultural, creative and educational potential, to make them full members of civil society with socially useful behavior.