With your phone constantly pinging, co-workers dropping by your desk, and friends emailing you must-watch videos, it's tough to stay focused at work. Too many unexpected interruptions can tank productivity. But a certain amount of distraction is normal — even healthy. "It's just human nature to be distracted, especially by social things," says David Rock, director of the NeuroLeadership Institute and author of Your Brain at Work. In fact, he says, fighting the urge to break concentration can derail your focus even more than what caught your attention in the first place.