What Makes Dickens a Lousy Running Buddy? Wall Street Journal
Some scientists are leaning into the idea that running and reading don't necessarily mix well. "When you do two things at once there is always a cost," says Daniel Willingham, a psychologist at the University of Virginia who researches the impact of multi-taking on the brain. Though the runner may not realize it consciously, his or her mind constantly switches back and forth between the two tasks—a ping-pong effect that might even be hazardous to a runner's health.