The question that plagues all 30-somethings. And the advice is always the same; eat well, get enough quality sleep, exercise. But what if you're already doing those things and you're still exhausted? If you work a desk job, the fatigue certainly isn't physical. So what's really going on here? This week we look at the "softer" side of fitness, and how what you have going on mentally and emotionally manifests itself as physical fatigue.