AUTHOR= TITLE=Retraction: The impact of COVID-19 and muscle fatigue on cardiorespiratory fitness and running kinetics in female recreational runners JOURNAL=Frontiers in Physiology VOLUME=Volume 17 - 2026 YEAR=2026 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2026.1793994 DOI=10.3389/fphys.2026.1793994 ISSN=1664-042X