I blog and whenever I hit a lull, I find that a walk or run is what gets me back on track. The chaos in a normal work week, the number of meetings, the constant context-switching all leads to little chance of forming coherent string of thoughts that can be used to construct a blog post.
Walks and runs also help in uncovering new ways to look at things, asking new questions that previously lay just beneath the surface, and letting your mind wander till they serendipitously uncover these nuances - those are the reasons I find time to do it. Everyone needs those quiet hours - when your mind could be free of clutter, and you could take a strand of thought and examine it more closely than you could have - when there are a hundred things vying for your attention.
Walking or running definitely helps to take your mind off of things long enough for it to realign itself on track. Semi related, but it also peaked my curiosity for nature and I started taking more note of different species I would see while walking or running, such as birds, insects and mammals.
Now, I end up walking partially because I'm always looking forward to what surprise I might see while doing it. Granted, not everyone has access to parks or land farther outside of a city, but when you do, there's lots of small details one misses out on if not looking for them (either up in the trees or near the ground). I still walk and run to refresh my brain, but it also spurred my interest in learning something new at the same time. As a side effect, I end up googling all those random things I run across, so beware of that if one wants to avoid time killers.
Walks and runs also help in uncovering new ways to look at things, asking new questions that previously lay just beneath the surface, and letting your mind wander till they serendipitously uncover these nuances - those are the reasons I find time to do it. Everyone needs those quiet hours - when your mind could be free of clutter, and you could take a strand of thought and examine it more closely than you could have - when there are a hundred things vying for your attention.