According to a recent study from the Journal of Labor Research, workers who exercise regularly earn 9% higher pay on average than those who don’t. The study expanded on the less scientific general idea that people who exercise are just more disciplined and less sloth-like than non-exercising counterparts. The study author used propensity-score matching to rate each study subject on whether they fit the profile of someone who exercises, based on factors like age, education level, and whether he or she played sports in high school. He then compared subjects with similar scores, including ones who don’t exercise to come across his conclusion.
Exercise has been shown in other studies to boost mental function and energy levels and improve mood. In that respect, it’s possible that it makes workers more valuable to employers.