Jakubowska, Klaudia, Magdalena Pawelec-Winiarz, Michał Włosiński, and Michał Cichosz. 2022. “Effect of Physical Activity on Peak Expiratory Flow and the 6-Minute Walk Test”. Journal of Education, Health and Sport 12 (6):323-30. https://doi.org/10.12775/JEHS.2022.12.06.031.