Using a daily diary approach to examine the early effects of COVID-19 on daily physical activity bouts and contexts among residents of Colorado and California.

"Conflict of Interest: None declared."

"Funding This study was funded by the National Institutes of Health grants R01HL119255 and U01HL146327. Jimikaye Courtney’s time was supported by the Prevention and Methodology Training Program (T32 DA017629; MPIs: J. Maggs & S. Lanza) with funding from the National Institute on Drug Abuse. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute on Drug Abuse or the National Institutes of Health."

"Transparency Statements: Study registration: This study was not formally registered.Analytic plan preregistration: The analysis plan was not formally preregistered.Data availability: Deidentified data from this study are not available in a public archive. Deidentified data from this study will be made available (as allowable according to institutional IRB standards) by emailing the corresponding author.Analytic code availability: Analytic code used to conduct the analyses presented in this study are not available in a public archive. They may be available by emailing the corresponding author.Materials availability: Materials used to conduct the study are not publicly available. They may be available by emailing the corresponding author."