In addition to healthy indoor space, having a safe place outside to go for a walk during lunch or on a break is also important. To encourage walking/ running and to help you track how far you have gone, there are signs on many walkways on the NIH campus that map out walking/running distances. If those don't exist where you work, do your own measurements to figure out how you can walk a half mile, mile, etc. indoors or outdoors. Some leased facilities have walking paths nearby for your lunchtime walking pleasure and exercise.