Photo: Nigel Cox

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Day 8: Sweat, Even Just a Bit
You might be surprised how little exercise it takes to do a body good. Just a daily 30-minute walk at a brisk pace can keep you from gaining weight and reduce your risk of stroke and heart attack by 30 percent. (To gauge whether you're working hard enough, do the "talk test": You should be able to speak but not sing.) A walk will do your body image good, too. University of Florida researcher Heather Hausenblas, PhD, found that the simple act of exercise—whether hiking a mountain or strolling around the neighborhood—led subjects to rate their own appearance higher than before.