When Doctor Qing Li came back to his home in the city after a long camping trip in the wilderness, he noticed he felt healthier. But where did this feeling come from? He was convinced that nature had something to do with it, so much so that he decided to study the effect that being in forests has on people. As it turns out, simply being around nature has measurable health benefits, which is why the doctor prescribes “forest bathing” as an actual treatment for his patients. Here’s why you should treat yourself with a walk through the forest too.