Feeling down? Well, if I said you could self-administer an upper that didn't require a prescription or any skuzzy dealings with the drug underworld or pharmacies in faraway lands, would you want it?If I told you even more - that this remedy was invisible but real, would you believe me?Well, maybe you wouldn't listen to me, but how about the white-coated docs at Duke University Medical Center who ran several studies comparing the benefits of a prescription antidepressant to the benefits of getting your body up and moving?Intrigued by the many indications that the motion of the body and the …