The Mobile Physical Co.

We all can agree it can be tough to work eight-nine hours and hit the gym. But here’s why you should: U.K. researchers found that workers were 15 percent more productive on days when they made time to exercise compared to days they skipped their workouts.

Now consider what these numbers mean to you: On days when you exercise, you can—theoretically, at least—accomplish in an 8-hour day what would normally take you 9 hours and 12 minutes.

Or work longer and get even more done, leaving you less stressed and feeling happier about your job—another perk that workers reported on the days they exercised. The lesson here: Make time for exercise and time may fly faster.