Published on in Vol 23, No 2 (2021): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/23701, first published
.
![Physical Activity Behavior Before, During, and After COVID-19 Restrictions: Longitudinal Smartphone-Tracking Study of Adults in the United Kingdom Physical Activity Behavior Before, During, and After COVID-19 Restrictions: Longitudinal Smartphone-Tracking Study of Adults in the United Kingdom](https://asset.jmir.pub/assets/52516e14fcef27d48e9163b51f7c5fab.png 480w,https://asset.jmir.pub/assets/52516e14fcef27d48e9163b51f7c5fab.png 960w,https://asset.jmir.pub/assets/52516e14fcef27d48e9163b51f7c5fab.png 1920w,https://asset.jmir.pub/assets/52516e14fcef27d48e9163b51f7c5fab.png 2500w)
1 University College London, London, United Kingdom
2 Institute of Health Informatics, University College London, London, United Kingdom
3 Department of Behavioural Science and Health, University College London, London, United Kingdom