TY JOUR TI Methods of increasing physical activity in various age groups using social networks and digital technologies KW physical activity KW age groups KW social networks KW digital technologies KW motivation for physical activity JO Scientific notes of P. F. Lesgaft University AU Osipenko, E.V. AU Luojing, Y.. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft