Adults who take the same walk at the same time every evening may not be creatures of rigid habit; they may have found that repetition in the body can help the mind finally set something down - Silicon Canals

What the report says

The nightly walk at the same time looks like rigidity from the outside. Inside the nervous system, it is one of the most reliable ways researchers have found to steady mood, protect the aging brain, and give the mind permission to finally release the day.