The next time you take a break while you're at work, stay away from your cell phone! I know, it's the first thing I grab when I take a short mental break but there is this study that says you need to leave your cell phone behind while taking a break. People who are glued to their phones while on a break don't 'recharge' their brains as effectively as those who leave them behind for different distractions.
Are you going to give this thought a try?