Instant Refresh

To make your workout high last longer, drink up.  According to a study in the Journal of Nutrition, becoming mildly dehydrated while exercising caused women to feel fatigued and less able to concentrate after their workout ended.  "Its easy to reach this point, especially if you're active," study coauthor Harris Lieberman, Ph.D., says.  "The problem is that many of us don't drink until we're thirsty, but by then we're already dehydrated." Help keep your mood upbeat by getting about 73 ounces of water a day, the amount recommended by the Institute of Medicine.