BRISTOL, ENGLAND -- Work places with on-site gyms could have more productive employees, a new study by researchers at the University of Bristol in England finds.

Scientists reviewed “mood diaries” from 200 employees, who held mainly sedentary office jobs, to see if their performance improved on days when they exercised during the work day versus days they did not. Employees' moods and performance improved on days when they were allowed to exercise. Employee tolerance and resilience also improved.

“There are clear implications not only for employee well-being, but also for competitive advantage and motivation by increasing opportunities for exercising at work,” the study's authors say.