Wang Z, Qin Z, He J, et al. - Among urban adults in China, researchers explored the residential density (RD)-physical activity (PA) link. Overall 1,551 eligible participants (aged 35–74 years old) who were randomly selected, using a multistage sampling approach, from urban areas of Nanjing in 2017, were interrogated (response rate = 98.9%). PA was considered as the outcome variable and was dichotomized into “sufficient” or “insufficient”. RD (tertiled into three sub-groups) was regarded as the independent variable. The likelihood of achieving sufficient physical activity was significantly less in participants who resided in communities with higher and middle residential density vs their counterparts who lived in the lower densed communities, after adjustment for potential confounders and community-level clustering influences. Among urban adults in regional China, findings revealed a negatively gradient RD-PA link, independent of body weight status and green space.