Participants in the greenest quartile of home neighbourhoods were more physically active overall at baseline than those in the least green quartile (mean 117.0 versus 107.2 MET hours per week, P<0.001, Fig. 1). Participants experienced a decline in physical activity between baseline and follow-up of 12.6 MET hours per week (hrs/wk) overall. This decline was significantly different according to quartile of greenspace (P=0.041). Decline was less for those in greener neighbourhoods, as physical activity declined by 12.6 MET h/wk in the most green areas, but 14.2 MET hrs/wk in the least green. For activity in outdoor locations, participants overall experienced an average decline of 1.0 MET h/wk between baseline and follow-up. Again, the decline was less in greener neighbourhoods, with a 0.5 MET h/wk reduction in the most green areas but a larger 1.8 MET h/wk decline in the least green (P=0.042, Fig. 2). Conversely, recreational physical activity increased slightly between baseline and follow-up, and this increase was greatest for those in the greenest neighbourhoods (mean 2.0 MET hours per week) compared to those in the least green (mean 0.5 MET hours per week) (Fig. 3), although this difference was not statistically significant (P=0.377).Fig. 1Mean (95% CI) overall physical activity energy expenditure (PAEE) at baseline and follow-up by quartile of greenspace in the home neighbourhood.Fig. 1.Fig. 2Mean (95% CI) outdoor physical activity energy expenditure (PAEE) at baseline and follow-up by quartile of greenspace in the home neighbourhood.Fig. 2.Fig. 3Mean (95% CI) recreational physical activity energy expenditure (PAEE) at baseline and follow-up by quartile of greenspace in the home neighbourhood.Fig. 3.