Exercising Outdoors in Nature Boosted Older Adults' Mental Health More Than Indoors

That is the finding of a systematic review and meta-analysis published in 2026 in Frontiers in Public Health. A systematic review gathers all the studies that meet set criteria. A meta-analysis then pools their results into one estimate. This one covered 26 studies with 1,468 older adults in total. According to the authors, Wang, Yang, Yu and Dong, it is the first meta-analysis to look at green exercise in older adults only.

Green exercise means structured physical activity in outdoor natural or semi-natural settings, where plants or other natural features are central. Examples include parks, forests, gardens and greenways. The review included only randomised controlled trials, in which people are assigned to groups by chance. Participants had to be aged 50 or older. The outcomes were mental health measures, including wellbeing and positive and negative mood.

The team searched five databases for studies published up to February 1, 2026. Two reviewers screened the studies independently. Risk of bias was assessed with a standard Cochrane tool. The results were reported as standardised mean differences, a way to compare studies that used different questionnaires. By the authors' scale, 0.2 to 0.5 is small, 0.5 to 0.8 is medium and above 0.8 is large.

Green exercise beat indoor exercise, with a difference of 0.70 (95% confidence interval 0.44 to 0.96). It beat exercise in urban settings, with a difference of 0.79 (0.44 to 1.15). It also beat waitlist control groups, who did not exercise, with a difference of 0.48 (0.14 to 0.81). On the authors' scale, the first two are medium, close to large. The waitlist result is small.

The authors also tested whether the benefit depended on other factors. These included region, the comparison group and features of the exercise programme. They found no significant moderators. The paper's list of planned checks also covered green space type, duration, frequency, age, share of women, outcome measure and publication year. The benefit did not clearly depend on any of the factors tested.

There are limits. The pooled sample is modest. The mental health measures were self-reported questionnaires. The studies differed in design and setting. A metaanalysis shows what the trials found on average. It cannot show why the effect occurs. The authors point to two ideas. Natural settings may ease mental fatigue, and they may lower stress. The review did not test these explanations.

The authors conclude that green exercise "may be an effective approach" for improving mental health in older adults. They say the findings highlight the importance of environmental context in shaping the mental health benefits of physical activity in later life. The wording is cautious, and so should be any reading of it. The review does not say how much time outdoors is needed or which routine works best.

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Larger trials that compare settings directly and test why nature seems to help.

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