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The New York Times had an interesting article about studies examining the health benefits of nature . Researchers have found that spending time in places with trees aplenty, such as parks and forests, is good for us and has a positive affect on our immune functions. Seems as if stress reduction is one factor that the scientists attribute to phytnocides, the “airborne chemicals that plants emit to protect them from rotting insects.” The Japanese have taken this to heart and even partake in a practice called “forest bathing.” 
As The Times notes, “the scientists found that being among plants produced lower concentrations of cortisol, lower pulse rate, and lower blood pressure, among other things.” So for all of you who walk your dogs in the woods, not only are you doing the right thing by providing sensory stimulation and exercise for them but you too get a healthy boost from the trees!