Researchers at Cleveland State University now say there's a connection between how much you work out, and how much money you make.

Vasilios Kosteas, the study's author says people who exercise regularly earn - on average - nine percent higher pay than those who don't.

Even the researchers admit their work is preliminary and further study is needed.

Other studies have shown that exercise boosts mental function and energy levels.

The study was published in the June issue of the Journal of Labor Research.