As temperatures drop, we all hunker down and try to stay warm and cozy indoors. In fact, most Americans spend more than 90% of their time indoors. Some have called it the human zoo syndrome. Some call it an epidemic of inactivity. Regardless, very few still heed their mothers sound advice, “Go outside; it’s good for you.” There are some excellent reasons for spending time outdoors, even in the winter, even if you are older, even if…, well, you get the picture.