Getting in touch with nature can help keep people fit, reducing the burden of sickness on the health service, conservation experts say.
Natural England is launching a campaign to get people to spend more time outside among the country's wildlife and natural environment.
It said being close to nature could cut stress and increase physical activity.
The conservation agency said the aim was to help prevent ill-health, such as obesity, rather than treat it.
Natural England health adviser Dr William Bird said: "Increasing evidence suggests that both physical and mental health are improved through contact with nature.
Source: BBC News