Grellier and teammates report that “Physical activity (PA) reduces the risk of several non-communicable diseases (NCDs). Natural environments support recreational PA. . . . Population-representative data from the Monitor of Engagement with the Natural Environment (MENE) survey . . . were used to estimate the weekly volume of nature-based recreational PA by adults in England in 2019. We used epidemiological dose–response data to calculate incident cases of six NCDs (ischaemic heart disease (IHD), ischaemic stroke (IS), type 2 diabetes (T2D),…