Potential conflicts of interest. S. B.-R. works for a state-financed organization that provides free information, guidance, and advice to patients with post–coronavirus disease across the Netherlands. M. H. reports honoraria for lectures from Pfizer and Boehringer Ingelheim, unrelated to this work. E. J. reports honoraria for postgraduate education at the Netherlands School of Occupational Health. K. J. reports other financial or nonfinancial interests as a member of the Exercise is Medicine Workgroup of the Dutch Sports and Exercise Medicine Society. The remaining author: no reported conflicts of interest. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed.