How would you like a 9% raise?
New research tells us that, all other things being equal, an individual who exercises regularly will earn 9% more than a person who does not.
Perhaps people who exercise regularly are more disciplined in general. People who have good habits in the gym are far more likely to have good habits on the job.
Perhaps people who exercise regularly have more energy and are thus better able to focus on the task at hand.
Perhaps people who exercise regularly have a better attitude and are generally in a better mood.
Most interesting to me is that the free labor market can tell the difference between the energetic and the slothful. It consistently rewards good habits.