There's nothing new about doctors recommending their patients take more exercise. But what kind?
You could pay a fortune for gym membership, or you could trudge down to your local swimming pool and spend the rest of the day smelling faintly of chlorine. But the best exercise of all might be the easiest and the cheapest: a stroll in the park, or a country ramble.
The secret ingredient? Greenery. Those of us who live in towns and cities, and even some who live in the countryside, don't get enough of it.
The result for most of us is highly stressful; we get irritable and depressed, and even physically ill (because high levels of stress mean higher risk of things like heart disease and diabetes).
Yet put us in contact with trees and grass and levels of stress fall away.
Source - BBC