 and they'll say okay at the end of that time we saw these changes and typically in mental health we do know though from kind of nature immersion studies that people spend say a long weekend in nature we might see actual changes in immune function so something called natural killer cells which is our body's immune ability to fight cancer increases from a weekend spent in nature and so we do think if people habitually exercise in natural environments you might see some of these other benefits coming but studies have not been done yet