PhD, Associate Professor G.G. Polevoy¹
H. Fuentes Barria^{2, 3}
R. Aguilera Eguia ^4
1Moscow Polytechnic University, Moscow
²Escuela de Odontología, Facultad de Odontología, Universidad Andrés Bello. Concepción, Chile
³Facultad de Educación y Ciencias Sociales, Universidad Central de Chile. Santiago, Chile
⁴Departamento de Salud Pública, Facultad de Medicina. Universidad Católica de la Santísima Concepción. Concepción, Chile

Objective of the study was to increase the flexibility of children in physical education lessons at school.
Methods and structure of the study. The pedagogical experiment was carried out on the basis of the second school in the city of Santiago (Chile) from September 5 to December 28, 2022. The study involved 40 children from the second grade. Children from the control group studied according to the usual physical education program at school, and children from the experimental group, after a short running warm-up, performed a set of exercises to develop flexibility.
Results and conclusions. After the end of the pedagogical experiment, the indicators in the control group improved from 7.4% to 9.9% (p>0.05). In the experimental group, scores improved in the “Slope” test by 36.4% (p<0.05). In the “Splits” test they showed an increase of 28.8% (p<0.05). The Stick Twist test also showed significant improvements of 18.7% from 42.2±5.3 to 34.3±5.6 (p<0.05).
If you use a set of exercises to develop flexibility in every physical education lesson, the performance of 8-9 year old children will improve significantly.

Keywords: sensitive periods, joint mobility, physical culture.

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