While stretching is a physical writer’s block remedy that you can complete at your desk (see Writer’s Block Remedies Part 1), going out for a walk will provide your brain with a bigger boost.
Walking increases breathing and heart rate, which forces more energy-enhancing, oxygenated blood up to thirsty brain cells. In addition, walking can help you pump up your brain muscles, or more accurately, encourage “cerebral blood vessels to grow,” as The Franklin Institute notes.
So the next time your brain is idling in front of a blank page, put your body into gear and go for a walk around the block.
More writer’s block remedies:
Erik Devaney 
Interresting read