Let's face it. Work can be a pain. Between deadlines, abrasive coworkers and budget cuts, the full-time office life often threatens to squelch even the cheeriest of employees. Now new research is proving what many of us have suspected for years -- work can be a literal pain, too.
There's no question that regular exercise is essential to health. For the vast majority of our evolutionary history, we've had to exert ourselves -- often quite strenuously -- to get food, find shelter and simply survive.