We've written about yoga and meditation at work before, and a new study suggests that exercise at work not only makes for happy employees, but more productive ones, too.

The Journal of Occupational and Environmental Medicine reports on a study that was conducted at a Swedish organization in which one group had a 2.5 hour per week exercise program during work hours, and another group had the same 2.5 hour reduction in work, but no exercise. A third group worked the same hours and had no exercise program.

The results?