AUTHOR=Stöggl Thomas L. , Sperlich Billy TITLE=Editorial: Training Intensity, Volume and Recovery Distribution Among Elite and Recreational Endurance Athletes JOURNAL=Frontiers in Physiology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2019.00592 DOI=10.3389/fphys.2019.00592 ISSN=1664-042X