Duplicate title to Roberts, CORCID logo; Rogers, N; Waterlow, NORCID logo; Brindle, HORCID logo; Enria, LORCID logo and Lees, SORCID logo (2020). Behavioural change towards reduced intensity physical activity is disproportionately prevalent among adults with serious health issues or self-perception of high risk during the UK COVID-19 lockdown. [Dataset]. London School of Hygiene & Tropical Medicine, London, United Kingdom. 10.17037/DATA.00001753.