00604naa#a2200181#i#450# EN\INFRA-M\bibl\36995 20260123120604.5 2306-1731 20200410b2020####ek#y0engy0150####ca RU Hobbyhorses: New Approaches in the Physical Activity of Children and Adolescents Journal article Moscow INFRA-M Academic Publishing LLC. 2020 4 с. Journal article local Статистика. Демография. Социология. 31 Ovchinnikov Yu. D. Stoylov A. Yu. zh-szf.ru