@article{Maretsky2025improvement,
author={Maretsky, S.Y.},
title={Improvement of breaststroke leg technique based on the development of key areas of flexibility of swimmers 9-11 years old},
journal={Scientific notes of P. F. Lesgaft University},
publisher={National State University of Physical Education, Sports and Health named after P.F. Lesgaft},
year={2025},
pages={189-192},
volume={0},
issue={12},
}